Holtek HT85F2270, HT85F2280, HT85F2260 User Manual
Standard 8051 8-Bit Flash MCU
HT85F2260
HT85F2270
HT85F2280
Revision: V1.00 Date: January 15, 2015January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
Table of Contents
1 Features ................................................................................................................. 14
CPU Features.................................................................................................................... 14
Peripheral Features ........................................................................................................... 15
2 General Description ............................................................................................. 16
Table of Contents
3 Selection Table
4 Block Diagram
5 Pin Assignment
6 Pin Descriptions
7 Absolute Maximum Ratings
8 D.C. Characteristics
9 A.C. Characteristics
10 ADC Electrical Characteristics
11 DAC Electrical Characteristics
12 Comparator Electrical Characteristics
...................................................................................................... 17
....................................................................................................... 18
..................................................................................................... 19
................................................................................................... 20
................................................................................. 23
.............................................................................................. 23
.............................................................................................. 25
......................................................................... 26
.......................................................................... 26
............................................................. 27
13 Power on Reset Electrical Characteristics
14 System Architecture
15 Program Counter
16 Stack
.................................................................................................................... 29
........................................................................................... 28
................................................................................................ 29
....................................................... 28
17 Arithmetic and Logic Unit – ALU
18 Flash Program Memory
Structure ............................................................................................................................ 31
Special Vectors.................................................................................................................. 31
In-Circuit Programming – ICP ........................................................................................... 32
On-Chip Debug Support – OCDS ..................................................................................... 32
In-Application Programming – IAP .................................................................................... 33
Flash Program Memory Resisters ..................................................................................... 33
Flash Memory Read/Write Operations .............................................................................. 37
Unlocking the Flash Memory ........................................................................................................ 37
Page Erase Operation .................................................................................................................. 38
Byte Read Operation .................................................................................................................... 39
Byte Write Operation .................................................................................................................... 40
Rev. 1.00 2 of 225 January 15, 2015
...................................................................................... 31
....................................................................... 30
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
Program Memory Protection ............................................................................................. 42
Memory Protection Control Bytes ................................................................................................. 42
19 RAM Data Memory .............................................................................................. 46
Structure ............................................................................................................................ 46
Register Banks .................................................................................................................. 50
Bit Addressable Space ...................................................................................................... 50
Special Function Registers................................................................................................ 52
ACC Register – Accumulator ........................................................................................................ 53
B Register .................................................................................................................................... 53
SP Register – Stack Pointer ......................................................................................................... 53
DPL, DPH, DPL1, DPH1 Registers – Data Pointer Registers ...................................................... 53
Data Pointer Select Registers ...................................................................................................... 54
Data Pointer Control Register....................................................................................................... 54
Program Status Word ................................................................................................................... 56
Table of Contents
20 Oscillators ........................................................................................................... 57
System Oscillator Overview .............................................................................................. 57
System Clock Conguration .............................................................................................. 57
External High Speed Crystal Oscillator – HXT ............................................................................. 57
Internal High Speed RC Oscillator – HIRC ................................................................................... 58
External Low Speed Crystal Oscillator – LXT ............................................................................... 58
Internal Low Speed RC Oscillator – LIRC .................................................................................... 59
21 Operating Modes and System Clocks .............................................................. 60
System Clocks Description................................................................................................ 60
Phase Locked Loop – PLL
Changing the PLL Frequency ....................................................................................................... 64
................................................................................................ 64
Operation Modes ............................................................................................................... 66
NORMAL Mode ............................................................................................................................ 66
IDLE Mode.................................................................................................................................... 66
Power-Down Mode ....................................................................................................................... 66
Power Control Register ..................................................................................................... 67
Standby Current Considerations ....................................................................................... 67
Wake-up ............................................................................................................................ 68
22 Watchdog Timer .................................................................................................. 69
Watchdog Registers .......................................................................................................... 70
Watchdog Timer Clock Source .......................................................................................... 73
Watchdog Timer Operation ............................................................................................... 73
Rev. 1.00 3 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
23 Low Voltage Detector – LVD .............................................................................. 75
LVD Register ..................................................................................................................... 75
LVD Operation ................................................................................................................... 75
24 Reset and Initialisation ....................................................................................... 76
Reset Overview ................................................................................................................. 76
Reset Operations .............................................................................................................. 77
Reset Source Register – RSTSRC............................................................................................... 77
Power-on Reset ............................................................................................................................ 78
RESET Pin Reset
Low Voltage Reset – LVR
Watchdog Reset
Comparator 0 Reset ..................................................................................................................... 82
Software Resets ........................................................................................................................... 83
SRST Register Software Reset .................................................................................................... 83
WDTCR Register Software Reset ................................................................................................ 84
LVRCR Register Software Reset ..................................................................................................84
ROM Code Check Reset
Reset Initial Conditions...................................................................................................... 85
......................................................................................................................... 79
............................................................................................................. 80
.......................................................................................................................... 81
.............................................................................................................. 85
Table of Contents
25 Interrupts ............................................................................................................. 91
Interrupt Registers ............................................................................................................. 91
Interrupt Operation .......................................................................................................... 103
Interrupt Priority ............................................................................................................... 106
Priority Levels ............................................................................................................................. 106
Priority Control Registers............................................................................................................ 108
External Interrupt ..............................................................................................................111
Comparator Interrupt ....................................................................................................... 112
A/D Converter Interrupt ................................................................................................... 11 3
Timer/Counter Interrupt ................................................................................................... 113
Time Base Interrupts ....................................................................................................... 113
2
I
C Interface Interrupt ...................................................................................................... 11 4
SPI Interface Interrupt ..................................................................................................... 11 5
UART Interface Interrupt ................................................................................................. 115
LVD Interrupt ................................................................................................................... 115
Interrupt Wake-up Function ............................................................................................. 11 6
Programming Considerations .......................................................................................... 116
Rev. 1.00 4 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
26 Input/Output Ports ............................................................................................ 117
Input/Output Port Overview ............................................................................................. 117
Register Description ........................................................................................................ 118
PnM0/PnM1 Registers – Port Mode Registers ........................................................................... 120
P0WAKE Register – Port 0 Wake-up ......................................................................................... 122
SRCR Register – Slew Rate Control .......................................................................................... 122
I/O Pin Structures ............................................................................................................ 123
Quasi-bidirectional I/O – All Ports ............................................................................................... 123
Push-pull Output – Ports 0~3 Only ............................................................................................. 124
Open-drain Output – Ports 0~3 Only .......................................................................................... 124
Input Only – Ports 0~3 Only ....................................................................................................... 124
Programming Considerations .......................................................................................... 125
27 Timer/Event Counters ...................................................................................... 126
Timer/Event Counter Summary ....................................................................................... 126
Table of Contents
28 Timer/Event Counters 0, 1, 3 ........................................................................... 127
Introduction...................................................................................................................... 127
Timer 0/Timer 1/Timer 3 Register Description ................................................................. 128
Mode 0 – 13-bit Counter/Timer Mode Operation .............................................................135
Mode 1 – 16-bit Counter/Timer Mode Operation .............................................................135
Mode 2 – 8-bit Auto-reload Counter/Timer Mode Operation ........................................... 136
Mode 3 – Two 8-Bit Timers/Counters Mode Operation – Timer 0 Only ........................... 137
29 Timer 2 with Additional 4-channel PCA .......................................................... 138
Introduction...................................................................................................................... 138
Timer 2 ............................................................................................................................140
Timer function ............................................................................................................................. 140
Event Counter function ............................................................................................................... 140
Gated Timer function .................................................................................................................. 140
Timer 2 with PCA ............................................................................................................. 141
Timer 2 Register Description ........................................................................................... 142
Capture Modes ................................................................................................................ 145
Capture On Edge Mode.............................................................................................................. 145
Capture On Write Mode .............................................................................................................. 145
Compare Modes .............................................................................................................. 146
Compare Mode 0 ........................................................................................................................ 146
Compare Mode 1 ........................................................................................................................ 148
Reload Mode ................................................................................................................... 150
Programmable Clock Output Mode ................................................................................. 151
Rev. 1.00 5 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
30 Analog to Digital Converter – ADC ................................................................. 152
A/D Overview .................................................................................................................. 152
A/D Converter Register Description ................................................................................ 153
A/D Converter Data Registers – ADRL, ADRH ...............................................................153
A/D Converter Control Registers – ADCR0, ADCR1, ADCR2, ADPGA .......................... 153
A/D Operation.................................................................................................................. 157
A/D Converter Clock Source ........................................................................................... 158
A/D Input Pins ................................................................................................................. 158
Temperature Sensor ........................................................................................................ 159
A/D Reference Voltage Source .......................................................................................159
Summary of A/D Conversion Steps ................................................................................. 160
A/D Conversion Timing....................................................................................................161
Programming Considerations .......................................................................................... 162
A/D Transfer Function ..................................................................................................... 162
Table of Contents
31 Digital to Analog Converter – DAC .................................................................. 163
DAC Register Description ............................................................................................... 163
DAC Operation ................................................................................................................ 165
DAC Reference Voltage Source ...................................................................................... 166
Programming Considerations .......................................................................................... 166
32 Voltage Reference Generator .......................................................................... 167
Voltage Reference Generator Operation ......................................................................... 167
33 Comparators ..................................................................................................... 169
Comparator Operation..................................................................................................... 169
Comparator Registers ..................................................................................................... 170
Comparator Interrupt ....................................................................................................... 175
Comparator Reset Function ............................................................................................ 175
Programming Considerations .......................................................................................... 175
34 I2C Serial Interface ............................................................................................ 176
I2C Interface Operation .................................................................................................... 176
2
I
C Registers ................................................................................................................... 177
2
I
C Bus Communication .................................................................................................. 181
I2C Bus Start Signal .................................................................................................................... 182
Slave Address............................................................................................................................. 182
I2C Bus Read/Write Signal .......................................................................................................... 182
I2C Bus Slave Address Acknowledge Signal .............................................................................. 182
I2C Bus Data and Acknowledge Signal ....................................................................................... 183
2
C Status Codes ........................................................................................................................ 184
I
Rev. 1.00 6 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
35 Serial Interface – SPI ........................................................................................ 189
SPI Interface Operation ................................................................................................... 189
SPI Features............................................................................................................................... 190
SPI Registers .................................................................................................................. 191
SPI Communication......................................................................................................... 194
36 UART Serial Interfaces – UART0 and UART1 ................................................. 197
UART Overview ...............................................................................................................197
UART0 Features ......................................................................................................................... 197
UART1 Features ......................................................................................................................... 197
Basic UART Data Transfer Scheme ........................................................................................... 198
UART0 Operating Description ......................................................................................... 199
UART0 External Pin Interfacing .................................................................................................. 199
UART0 Register Description ...................................................................................................... 200
UART0 Operating Modes ........................................................................................................... 204
UART0 Multiprocessor Communication .................................................................................... 208
UART0 Baud Rate Setup ........................................................................................................... 208
UART1 Operating Description ......................................................................................... 209
UART1 External Pin Interfacing .................................................................................................. 209
UART1 Register Description ...................................................................................................... 210
UART1 Operating Modes ........................................................................................................... 213
UART1 Multiprocessor Communication ..................................................................................... 215
UART1 Baud Rate Setup ........................................................................................................... 215
Table of Contents
37 Instruction Set ................................................................................................... 216
Introduction...................................................................................................................... 216
Read-Modify-Write Instruction ......................................................................................... 221
38 Package Information ........................................................................................ 222
48-pin LQFP (7mm×7mm) Outline Dimensions .............................................................. 223
64-pin LQFP (7mm × 7mm) Outline Dimensions ............................................................ 224
Rev. 1.00 7 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
List of Tables
Program Memory Register List ................................................................................................................ 33
FMAR0 Register – Flash Program Memory Address Register 0 ............................................................. 33
FMAR1 Register – Flash Program Memory Address Register 1 ............................................................. 34
FMAR2 Register – Flash Program Memory Address Register 2 ............................................................. 34
FMDR Register – Flash Program Memory Data Register ....................................................................... 34
FMCR Register – Flash Program Memory Control Register ................................................................... 35
FMKEY Register – Flash Program Memory Unlock Key Data Register .................................................. 36
FMSR Register – Flash Program Memory Status Register ..................................................................... 36
HT85F2260 Program Memory Contents .................................................................................................. 43
HT85F2270 Program Memory Contents .................................................................................................. 44
HT85F2280 Program Memory Contents .................................................................................................. 44
Security Bytes .......................................................................................................................................... 44
General Purpose Data RAM, 20H~2FH, Bit Address Map ...................................................................... 50
Special Function Register Bit Addresses Map ......................................................................................... 51
Special Function Register Map ................................................................................................................ 52
DPS Register – Data Pointer Select Register .......................................................................................... 54
DPC Register – Data Pointer Control Register ........................................................................................ 55
PSW Register – Program Status Word Register ..................................................................................... 56
Crystal Recommended Capacitor Values ................................................................................................ 58
32768Hz Crystal Recommended Capacitor Values ................................................................................. 59
System Clock Control Register – SCCR .................................................................................................. 62
High Speed Oscillator Control Register – HSOCR .................................................................................. 63
Low Speed Oscillator Control Register – LSOCR ................................................................................... 63
PLL Control Register – PLLCR ................................................................................................................ 65
PCON Register – Power Control Register ............................................................................................... 67
WDT Register Contents ........................................................................................................................... 70
IEN0 Register .......................................................................................................................................... 70
IEN1 Register .......................................................................................................................................... 71
WDTREL Register ................................................................................................................................... 71
WDTCR Register ..................................................................................................................................... 72
IP0 Register ............................................................................................................................................. 72
Watchdog Timer Enable/Disable Control ................................................................................................. 73
LVDCR Register....................................................................................................................................... 75
Reset Source Summary ........................................................................................................................... 76
RSTSRC Register .................................................................................................................................... 77
LVRCR Register....................................................................................................................................... 80
IP0 Register ............................................................................................................................................. 81
T2CON1 Register .................................................................................................................................... 82
CP0CR Register ...................................................................................................................................... 83
Software Reset Summary ........................................................................................................................ 84
SRST Register ......................................................................................................................................... 84
WDTCR Register ..................................................................................................................................... 85
LVRCR Register....................................................................................................................................... 85
List of Tables
Rev. 1.00 8 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
Interrupt Register Bit Naming Conventions ............................................................................................. 92
Interrupt Register Contents ...................................................................................................................... 93
IEN0 Register .......................................................................................................................................... 93
IEN1 Register .......................................................................................................................................... 94
IEN2 Register .......................................................................................................................................... 94
IEN3 Register .......................................................................................................................................... 95
IRCON Register ....................................................................................................................................... 96
IRCON2 Register ..................................................................................................................................... 97
S0CON Register ...................................................................................................................................... 98
S1CON Register ...................................................................................................................................... 99
TCON Register ...................................................................................................................................... 100
T2CON Register .................................................................................................................................... 101
T3CON Register .................................................................................................................................... 101
SPSTA Register ..................................................................................................................................... 102
CPICR Register ..................................................................................................................................... 103
I2CCON Register ................................................................................................................................... 104
Low byte of Interrupt Priority Register 0: IP0 ......................................................................................... 109
High byte of Interrupt Priority Register 0: IP0H ...................................................................................... 109
Low byte of Interrupt Priority Register 1: IP1 ..........................................................................................110
High byte of Interrupt Priority Register 1: IP1H .......................................................................................110
Low byte of Interrupt Priority Register 2: IP2 ..........................................................................................111
High byte of Interrupt Priority Register 2: IP2H .......................................................................................111
Low byte of Interrupt Priority Register 3: IP3 ..........................................................................................111
How byte of Interrupt Priority Register 3: IP3H .......................................................................................112
External Interrupt Trigger Type ...............................................................................................................112
CPICR Register ......................................................................................................................................113
TBCR Register ........................................................................................................................................115
I/O Port Function Summary ....................................................................................................................118
I/O Register List ......................................................................................................................................119
P0 Register .............................................................................................................................................119
P1 Register .............................................................................................................................................119
P2 Register ............................................................................................................................................ 120
P3 Register ............................................................................................................................................ 120
P4 Register ............................................................................................................................................ 120
P5 Register ............................................................................................................................................ 120
Port 0 Mode Control ............................................................................................................................... 121
P0M0 Register ....................................................................................................................................... 121
P0M1 Register ....................................................................................................................................... 121
Port 1 Mode Control ............................................................................................................................... 121
P1M0 Register ....................................................................................................................................... 121
P1M1 Register ....................................................................................................................................... 121
Port 2 Mode Control ............................................................................................................................... 122
P2M0 Register ....................................................................................................................................... 122
P2M1 Register ....................................................................................................................................... 122
Port 3 Mode Control ............................................................................................................................... 122
P3M0 Register ....................................................................................................................................... 122
List of Tables
Rev. 1.00 9 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
P3M1 Register ....................................................................................................................................... 122
P0WAKE Register .................................................................................................................................. 123
SRCR Register ...................................................................................................................................... 123
Timer Function Summary ....................................................................................................................... 127
Timer0/Timer1/Timer3 Register List ....................................................................................................... 129
TL0 Register ......................................................................................................................................... 129
TH0 Register ......................................................................................................................................... 130
TL1 Register .......................................................................................................................................... 130
TH1 Register .......................................................................................................................................... 131
TL3 Register .......................................................................................................................................... 131
TH3 Register .......................................................................................................................................... 132
TMOD Register ...................................................................................................................................... 132
TCON Register ...................................................................................................................................... 133
T3CON Register ................................................................................................................................... 134
TMPRE Register .................................................................................................................................... 135
13-bit Counter Data ............................................................................................................................... 136
Timer 2 with PCA Modules Operating Modes Summary ........................................................................ 139
Timer 2 with PCA Modules I/O Pins ....................................................................................................... 139
Timer 2 Register List .............................................................................................................................. 143
CCEN Register ..................................................................................................................................... 143
T2CON Register .................................................................................................................................... 144
T2CON1 Register ................................................................................................................................. 145
A/D Converter Register List ................................................................................................................... 154
A/D Data Registers ................................................................................................................................ 154
ADCR0 Register ................................................................................................................................... 155
ADCR1 Register .................................................................................................................................... 156
ADCR2 Register .................................................................................................................................... 157
ADPGA Register .................................................................................................................................... 158
A/D Clock Period Examples ................................................................................................................... 159
A/D Converter Voltage Reference Select .............................................................................................. 160
DAH Register ......................................................................................................................................... 164
DAL Register .......................................................................................................................................... 164
DACTRL Register .................................................................................................................................. 164
DAC Converter Voltage Reference Select ............................................................................................. 167
Internal Voltage Reference Enable/Disable Control .............................................................................. 168
Comparator Registers List ..................................................................................................................... 171
CP0CR Register .................................................................................................................................... 172
CP1CR Register .................................................................................................................................... 173
CPHCR Register .................................................................................................................................... 174
CPICR Register ..................................................................................................................................... 175
I2C Register List .................................................................................................................................... 178
I2CCON Register ................................................................................................................................... 178
I2CLK Register ...................................................................................................................................... 179
I2CSTA Register .................................................................................................................................... 180
I2CDAT Register .................................................................................................................................... 180
List of Tables
Rev. 1.00 10 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
I2CADR Register ................................................................................................................................... 180
2
C Status in Master Transmitter Mode .................................................................................................. 185
I
I2C Status in Master Receiver Mode ..................................................................................................... 186
2
C Status in Slave Receiver Mode ........................................................................................................ 187
I
2
C Status in Slave Transmitter Mode .................................................................................................... 188
I
2
C Status: Miscellaneous States .......................................................................................................... 189
I
SPI Register List .................................................................................................................................... 192
SPDAT Register ..................................................................................................................................... 192
SPCON Register .................................................................................................................................... 193
SPSTA Register ..................................................................................................................................... 194
UART0 Register List .............................................................................................................................. 201
S0BUF Register – UART0 Data register................................................................................................ 201
S0CON Register – UART0 Control register ........................................................................................... 202
S0RELL Register – UART0 Reload Low Register ................................................................................. 203
S0RELH Register – UART0 Reload High Register................................................................................ 203
SPPRE Register – UART Clock Prescaler Register .............................................................................. 203
SBRCON Register ................................................................................................................................. 204
PCON Register ...................................................................................................................................... 204
UART0 Operating Modes....................................................................................................................... 205
Mode 0 ................................................................................................................................................... 205
UART1 Register List ...............................................................................................................................211
S1BUF Register – UART1 Data register.................................................................................................211
S1CON Register – UART1 Control register ........................................................................................... 212
S1RELL Register – UART1 Reload Low Register ................................................................................. 213
S1RELH Register – UART1 Reload High Register................................................................................ 213
SPPRE Register – UART Clock Prescaler Register .............................................................................. 213
UART1 Operating Modes....................................................................................................................... 214
Notes on Data Addressing Modes ......................................................................................................... 217
Notes on Program Addressing Modes ................................................................................................... 217
Arithmetic Operations ............................................................................................................................ 218
Logic Operations .................................................................................................................................... 219
Data transfer Operations ....................................................................................................................... 220
Program Branches ................................................................................................................................. 221
Boolean Manipulation ............................................................................................................................ 222
List of Tables
Rev. 1.00 11 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
List of Figures
Stack Block Diagram ............................................................................................................................... 29
Program Memory Structure ..................................................................................................................... 31
Unlock Procedure Flowchart .................................................................................................................... 37
Page Erase Flowchart ............................................................................................................................. 38
Byte Read Flowchart ............................................................................................................................... 39
Byte Write Flowchart (FMCR.0=1, FMCR.6=0) ....................................................................................... 40
Byte Write Flowchart (FMCR.0=1, FMCR.6=1) ....................................................................................... 41
Internal Data Memory Structure ............................................................................................................... 47
HT85F2270/HT85F2280 XDATA .............................................................................................................. 48
HT85F2260 XDATA .................................................................................................................................. 49
DPTRn Registers Control Block Diagram ................................................................................................ 53
Crystal/Resonator Oscillator – HXT ......................................................................................................... 58
External LXT Oscillator – LXT .................................................................................................................. 59
System Clock Congurations ................................................................................................................... 61
PLL Frequency Changing ........................................................................................................................ 64
Watchdog Timer ....................................................................................................................................... 69
Watchdog Timer Refresh Operation ........................................................................................................ 74
Power-On Reset Timing .......................................................................................................................... 78
Interrupt Structure .................................................................................................................................. 105
Interrupt Flowchart ................................................................................................................................. 106
Time Base Clock Source Select .............................................................................................................114
Quasi-bidirectional I/O Structure ............................................................................................................ 124
Push-pull Output Structure .................................................................................................................... 125
Open-drain Output Structure ................................................................................................................. 125
Input Only Structure ............................................................................................................................... 125
Mode 0 and Mode 1 Block Diagram – Timer 0, 1, 3 .............................................................................. 136
Mode 2 Block Diagram – Timer 0, 1, 3 .................................................................................................. 137
Mode 3 Block Diagram – Timer 0 .......................................................................................................... 138
Timer 2 with PCA Modules Block Diagram ............................................................................................ 140
Capture Modes Block Diagram .............................................................................................................. 146
Compare Mode 0 – Module 1, Module 2, Module 3 ............................................................................... 147
Compare Mode 0 – Module 0 ................................................................................................................ 148
Compare Mode 0 Timing Diagram ......................................................................................................... 148
Compare Mode 1 – Module1, Module2, Module 3 ................................................................................. 149
Compare Mode 1 – Module 0 ................................................................................................................ 149
Compare Mode 1 Timing Diagram ......................................................................................................... 150
Reload Mode – Module 0 ....................................................................................................................... 151
Timer2 Clock Output Block Diagram ...................................................................................................... 152
Programmable Clock Output Timing Diagram – Module 0 .................................................................... 152
A/D Converter Structure ........................................................................................................................ 153
A/D Conversion Timing .......................................................................................................................... 162
Ideal A/D Transfer Function (PGA=1) .................................................................................................... 163
DAC Basic Operational Block Diagram ................................................................................................. 166
List of Figures
Rev. 1.00 12 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
Voltage Reference Generator Block Diagram ........................................................................................ 169
Comparator 0 ......................................................................................................................................... 170
Comparator 1 ......................................................................................................................................... 171
2
C Master Slave Bus Connection .......................................................................................................... 177
I
2
C Interface Operation Flow .................................................................................................................. 177
I
2
C Block Diagram .................................................................................................................................. 181
I
2
C Bus Initialisation Flow Chart ............................................................................................................ 182
I
I2C Communication Timing Diagram ...................................................................................................... 184
Single SPI Master and single Slave Connection ................................................................................... 190
SPI Interface Block Diagram .................................................................................................................. 191
SPI Master Mode Timing ....................................................................................................................... 195
SPI Slave Mode Timing – CPHA=0 ....................................................................................................... 196
SPI Slave Mode Timing – CPHA=1
SPI Transfer Control Flowchart .............................................................................................................. 197
Basic UART Data Transfer Diagram ...................................................................................................... 199
UART 0 Block Diagram .......................................................................................................................... 200
UART0 Mode 0 Timing Diagram ............................................................................................................ 205
UART0 Mode 1 Timing Diagram ............................................................................................................ 206
UART0 Mode 2 Timing Diagram ............................................................................................................ 207
UART0 Mode 3 Timing Diagram ............................................................................................................ 208
UART0 Baud Rate Generator ................................................................................................................ 209
UART1 Block Diagram ........................................................................................................................... 210
UART1 Mode A Timing Diagram ............................................................................................................ 214
UART1 Mode B Timing Diagram............................................................................................................ 215
UART1 Baud Rate Generator ................................................................................................................ 216
....................................................................................................... 196
List of Figures
Rev. 1.00 13 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
1
Features
CPU Features
Operating Voltage:
■
● f
● f
● f
● f
Program Memory Capacity: 16K×8~64K×8
■
Data Memory Capacity: 1280×8~2304×8
■
High performance 1-T architecture: 8051
■
Up to 32MIPS with 32MHz system clock at V
■
8051 compatible instruction set
■
Flexible Power-down and wake-up functions to reduce power consumption
■
Oscillator types:
■
● External high frequency crystal
● Internal high frequency RC
● External low frequency crystal
● Internal low frequency RC
=3.6864MHz: 2.2V~5.5V
SYS
=8MHz: 2.2V~5.5V
SYS
=12MHz: 2.7V~5.5V
SYS
=24MHz: 4.5V~5.5V
SYS
DD
Features
=5V
Multi-mode operation: Normal, Idle and Power-Down Modes
■
Fully integrated internal 3.6864MHz oscillator requires no external components
■
Internal PLL to multiply oscillator frequency up to 1~8 times for high speed system clock
■
Watchdog Timer function
■
Dual 16-bit data pointers with addition arithmetic operation
■
Rev. 1.00 14 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
Peripheral Features
Multi-channel 12-bit resolution A/D converter
■
Single 12-bit D/A Converter
■
Serial SPI Interface
■
2
C Interface
I
■
Dual UART Interfaces
■
Dual Comparator functions
■
Up to 48 bidirectional I/O lines
■
16-bit Programmable Counter Array with 5 Capture/Compare Modules
■
16-bit Programmable Counter Array
■
Single Time-Base functions for generation of xed time interrupt signal
■
Internal Temperature Sensor
■
Low voltage reset function
■
Features
Low voltage detect function
■
Package types: 48-LQFP and 64-LQFP
■
Rev. 1.00 15 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
2
General Description
The HT85F22x0 series of devices are Flash Memory A/D type high performance 1-T architecture
8051-Based microcontrollers. Offering users the convenience of Flash Memory multi-programming
features, these devices also include a wide range of functions and features.
Analog features include a multi-channel 12-bit A/D converter, a 12-bit D/A converter and dual
comparator functions. Multiple timers provide timing, capture, event counter and programmable
clock output functions. Communication with the outside world is catered for by including fully
integrated SPI, I
with a means of easy communication with external peripheral hardware. Protective features such
as an internal Watchdog Timer, Low Voltage Reset and Low Voltage Detector and excellent noise
immunity and ESD protection ensure that reliable operation is maintained in hostile electrical
environments.
A full choice of both internal and external high and low speed oscillators are provided with the
internal oscillators requiring no external components for its implementation. A fully internal Phase
Locked Loop and the ability to operate and switch dynamically between a range of operating
modes using different clock sources gives users the ability to optimise microcontroller operation
and minimize power consumption.
The inclusion of exible I/O programming features, Time-Base functions along with many other
features ensure that the device will nd excellent use in applications such as electronic metering,
environmental monitoring, handheld instruments, household appliances, electronically controlled
tools, motor driving in addition to many others.
2
C and UART interface functions, popular interfaces which provide designers
General Description
The HT85F22x0 series are Flash devices offering the advantages of easy and effective in-circuit
program updates. In addition, an EV chip, HT85V2280, includes an OCDS (On-Chip Debug
Support) interface for the In-Circuit Emulator.
Rev. 1.00 16 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
3
Selection Table
Most features are common to all devices, the main feature distinguishing them are Program
Memory and Data memory capacity, A/D channels, UART numbers and packages. The following
table summarises the main features of each device.
Part No. V
HT85F2260 2.2V~5.5V 16K×8 1280×8 32 7 4 CCU×4 1
HT85F2270 2.2V~5.5V 32K×8 2304×8 48 7 4 CCU×4 1
HT85F2280 2.2V~5.5V 64K×8 2304×8 48 7 4 CCU×4 1
Part No. A/D D/A Comparator I2C SPI UART
HT85F2260 12-bit×7 12-bit×1 2 √ √ 1 √ 48LQFP
HT85F2270 12-bit×9 12-bit×1 2 √ √ 2 √ 48/64LQFP
HT85F2280 12-bit×9 12-bit×1 2 √ √ 2 √ 48/64LQFP
Note:
CCU stands for Compare/Capture Unit.
DD
Program
Memory
Data
Memory
I/O
Ext.
Interrupt
16-bit Timer 16-bit PCA Time Base
Temp.
Sensor
package
Selection Table
Rev. 1.00 17 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
4
Block Diagram
The following block diagram illustrates the main functional blocks.
3.6864MHz
32768Hz
I
Block Diagram
× ×
Rev. 1.00 18 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
5
Pin Assignment
Pin Assignment
Note:
1. If the pin-shared pin functions have multiple outputs simultaneously, its pin names at the right side of the “/”
sign can be used for higher priority.
2. For both the 48 LQFP-A and 64 LQFP-A packages, both real IC and OCDS EV IC share the same
package.
Rev. 1.00 19 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
6
Pin Descriptions
With the exception of the power pins, all pins on these devices can be referenced by their Port
name, e.g. P0.0, P0.1 etc, which refer to the digital I/O function of the pins. However these Port
pins are also shared with other function such as the Analog to Digital Converter, Serial Port pins
etc. The function of each pin is listed in the following table, however the details behind how each
pin is congured is contained in other sections of the datasheet.
Pin Name Function OPT I/T O/T Description
P0.0/ICPDA/TDA
P0.1/C1OUT
P0.2/SSN
P0.3/SCK
P0.4/MISO
P0.5/MOSI
P0.6/SCL
P0.7/SDA
P1.0/INT3/CC0
P1.1/INT4/CC1
P1.2/INT5/CC2
P0.0
ICPDA — ICP Data Input/Output
TDA — Debug Data Input/Output
P0.1
C1OUT — — CMOS Comparator 1 Output
P0.2
SSN — ST — SPI Slave select Input
P0.3
SCK — ST CMOS SPI Clock
P0.4
MISO — ST CMOS SPI Master In Slave Out pin
P0.5
MOSI — ST CMOS SPI Master Out Slave In pin
P0.6
SCL — — NMOS I2C Clock
P0.7
SDA — — NMOS I2C Data
P1.0
INT3 — ST — External Interrupt 3 Input
CC0 — ST CMOS Compare/Capture input/output for PCA module 0
P1.1
INT4 — ST — External Interrupt 4 Input
CC1 — ST CMOS Compare/Capture input/output for PCA module 1
P1.2
INT5 — ST — External Interrupt 5 Input
CC2 — ST CMOS Compare/Capture input/output for PCA module 2
P0M0
P0M1
P0WAKE
P0M0
P0M1
P0WAKE
P0M0
P0M1
P0WAKE
P0M0
P0M1
P0WAKE
P0M0
P0M1
P0WAKE
P0M0
P0M1
P0WAKE
P0M0
P0M1
P0WAKE
P0M0
P0M1
P0WAKE
P1M0
P1M1
P1M0
P1M1
P1M0
P1M1
ST CMOS
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode and wake-up
ST CMOS
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode and wake-up
ST CMOS
ST CMOS
ST CMOS
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode and wake-up
General purpose I/O. Register selected I/O mode and wake-up
General purpose I/O. Register selected I/O mode and wake-up
General purpose I/O. Register selected I/O mode and wake-up
General purpose I/O. Register selected I/O mode and wake-up
General purpose I/O. Register selected I/O mode and wake-up
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
Pin Descriptions
Rev. 1.00 20 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
Pin Name Function OPT I/T O/T Description
P1.3
P1.3/INT6/CC3
P1.4/INT2
P1.5/T2EX
P1.6/T2
P1.7 P1.7
P2.0~P2.6 P2.0~P2.6
P2.7/T3
P3.0/RXD0
P3.1/TXD0
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
P3.6/RXD1
P3.7/TXD1
P4.0/AIN.0
P4.1/AIN.1
P4.2/AIN.2
INT6 — ST — External Interrupt 6 Input
CC3 — ST CMOS Compare/Capture input/output for PCA module 3
P1.4
INT2 — ST — External Interrupt 2 Input
P1.5
T2EX — ST — Timer 2 capture trigger
P1.6
T2 — ST CMOS Timer 2 external input or Timer 2 programmable clock output
P2.7
T3 — ST — Timer 3 External Input
P3.0
RXD0 — ST — UART0 Receive Data Input
P3.1
TXD0 — — CMOS UART0 Transmit Data Output
P3.2
INT0 — ST — External Interrupt 0 Input
P3.3
INT1 — ST — External Interrupt 1 Input
P3.4
T0 — ST — Timer 0 External Input
P3.5
T1 — ST — Timer 1 External Input
P3.6
RXD1 — ST — UART1 Receive Data Input
P3.7
TXD1 — — CMOS UART1 Transmit Data Output
P4.0
AIN.0 — AN — ADC Input Channel 0
P4.1
AIN.1 — AN — ADC Input Channel 1
P4.2
AIN.2 — AN — ADC Input Channel 2
P1M0
P1M1
P1M0
P1M1
P1M0
P1M1
P1M0
P1M1
P1M0
P1M1
P2M0
P2M1
P2M0
P2M1
P3M0
P3M1
P3M0
P3M1
P3M0
P3M1
P3M0
P3M1
P3M0
P3M1
P3M0
P3M1
P3M0
P3M1
P3M0
P3M1
P4M0
P4M1
P4M0
P4M1
P4M0
P4M1
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS
ST CMOS
ST CMOS
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
Pin Descriptions
Rev. 1.00 21 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
Pin Name Function OPT I/T O/T Description
P4.3/AIN.3
P4.4/AIN.4
P4.5/AIN.5
P4.6/AIN.6
P4.7/AIN.7
P5.0~P5.3 P5.0~P5.3
P5.4/C0OUT
P5.5/XT1
P5.6/XT2
P5.7/DAC
CP0-/CP0+
CP1-/CP1+
OSC1 OSC1 — HXT — High Frequency Crystal Oscillator
OSC2 OSC2 — — HXT High Frequency Crystal Oscillator
RESET/ICPCK/TCK
VREF VREF — AN — Reference Voltage for ADC/DAC
VDD VDD — PWR — Positive Power supply for CORE
VCCA1 VCCA1 — PWR — Positive Power supply for I/O pad
VCCA2 VCCA2 — PWR — Positive Power supply for DAC
VCCA3 VCCA3 — PWR — Positive Power supply for ADC
VSS VSS — PWR — Negative Power supply
P4.3
AIN.3 — AN — ADC Input Channel 3
P4.4
AIN.4 — AN — ADC Input Channel 4
P4.5
AIN.5 — AN — ADC Input Channel 5
P4.6
AIN.6 — AN — ADC Input Channel 6
P4.7
AIN.7 — AN — ADC Input Channel 7
P5.4
C0OUT — — CMOS Comparator 0 Output
P5.5
XT1 — LXT — Low Frequency Crystal Oscillator
P5.6
XT2 — — LXT Low Frequency Crystal Oscillator
P5.7
DAC — — CMOS DAC Output
CP0- — AN —
CP0+ — AN — Comparator 0 Non-Inverting Input
CP1- — AN —
CP1+ — AN — Comparator 1 Non-Inverting Input
RESET — ST — RESET pin
ICPCK — ST —
TCK — ST — Debug Clock Input
P4M0
P4M1
P4M0
P4M1
P4M0
P4M1
P4M0
P4M1
P4M0
P4M1
P5M0
P5M1
P5M0
P5M1
P5M0
P5M1
P5M0
P5M1
P5M0
P5M1
ST CMOS
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS
ST CMOS
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS General purpose I/O. Register selected I/O mode
ST CMOS General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
General purpose I/O. Register selected I/O mode
Comparator 0 Inverting Input
Comparator 1 Inverting Input
ICP Clock Input
Pin Descriptions
Note:
I/T: Input type; O/T: Output type; ST: Schmitt Trigger input
OPT: Optional by conguration option (CO) or register option
PWR: Power; NMOS: NMOS output
CMOS: CMOS output; AN: Analog input pin
LXT: low frequency crystal oscillator; HXT: high frequency crystal oscillator
Where devices exist in more than one package type the table reflects the situation for the package with the
largest number of pins. For this reason not all pins described in the table may exist on all package types.
Rev. 1.00 22 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
7
Absolute Maximum Ratings
Supply Voltage .................................................................................................VSS-0.3V to VDD+6.0V
Input Voltage ................................................................................................... VSS-0.3V to VDD+0.3V
Storage Temperature ...................................................................................................-50°C to 125°C
Operating Temperature ................................................................................................ -40°C to 85°C
Tot al
I
......................................................................................................................................150mA
OL
IOH Tota l ................................................................................................................................... -100m A
Total Power Dissipation ...........................................................................................................5 00mW
Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute
Maximum Ratings” may cause substantial damage to the device. Functional operation of
this device at other conditions beyond those listed in the specification is not implied and
prolonged exposure to extreme conditions may affect device reliability.
8
Symbol Parameter
V
DD1
V
DD2
V
DD3
V
DD4
V
DD5
I
DD1
I
DD2
I
DD3
I
DD4
I
DD5
D.C. Characteristics
Operating Voltage
(High Frequency Internal RC OSC)
Operating Voltage
(Crystal OSC)
Operating Voltage
(PLL)
Operating Voltage
(PLL)
Operating Voltage
(PLL)
Operating Current
(High Frequency Internal RC OSC)
Operating Current
(Crystal OSC)
Operating Current (PLL)
Operating Current (PLL) 5V
Operating Current (PLL) 5V
Test Conditions
V
DD
f
OSC=fSYS
—
(PLL disabled)
f
OSC=fSYS
—
(PLL disabled)
f
OSC
—
f
=12MHz (PLL × 3)
SYS
f
OSC
—
f
=16MHz (PLL × 4)
SYS
f
OSC
—
f
=24MHz (PLL × 6)
SYS
No load, f
3V
(PLL disabled) ADC off, DAC off,
5V — 10.0 15.0
WDT enable
No load, f
3V
(PLL disabled)
5V — 12.5 20
ADC off, DAC off, WDT enable
No load, f
3V
f
=12MHz (PLL × 3)
SYS
5V — 16 25
ADC off, DAC off, WDT enable
No load,
f
OSC
f
=16MHz (PLL × 4)
SYS
ADC off, DAC off, WDT enable
No load,
f
OSC
f
=24MHz (PLL × 6)
SYS
ADC off, DAC off, WDT enable
Conditions
=3.6864MHz
=8MHz
=4MHz (Crystal OSC)
=4MHz (Crystal OSC)
=4MHz (Crystal OSC)
=3.6864MHz ,
OSC=fSYS
=8MHz ,
OSC=fSYS
=4MHz (Crystal OSC)
OSC
=4MHz (Crystal OSC)
=4MHz (Crystal OSC)
Min. Typ. Max. Unit
2.2 — 5.5 V
2.2 — 5.5 V
2.7 — 5.5 V
3.3 — 5.5 V
4.5 — 5.5 V
— 5.0 8.0
— 6.0
— 8.0
— 20 30 mA
— 28 40 mA
8.5
12.0
Absolute Maximum Ratings
Ta=25°C
mA
mA
mA
Rev. 1.00 23 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
Symbol Parameter
I
I
V
V
V
V
I
I
I
I
STB1
STB2
OL
OH1
OH2
IL
Stanby Current
r-Down mode)(HIRC off, HXT off)
(Powe
Stanby Current (Idle)
(HIRC off, HXT on)
Input Low Voltage (except RESET pin) — quasi-bidirection mode 0 — 0.2VDDV
IL1
Input High Voltage (except RESET pin) — quasi-bidirection mode 0.8VDD— V
IH1
Input Low Voltage (RESET pin) — — 0 — 0.4VDDV
IL2
Input High Voltage (RESET pin) — — 0.9VDD— V
IH2
I/O Port Sink Current
I/O Port Source Current
(push-pull mode for Ports 0, 1, 2, 3)
I/O Port Source Current
(quasi-bidirection mode for Ports 0, 1, 2, 3, 4, 5)
Logical 0 input current, Ports 0, 1, 2, 3, 4, 5
(quasi-bidirection mode)
Logical 1 to 0 transition
I
TL
Current, Ports 0, 1, 2, 3, 4, 5
(quasi-bidirection mode)
I
LI
V
I
BG
I
LVR
I
LVD
V
V
V
V
V
V
V
V
V
V
V
V
Input Leakage current, Ports 0, 1, 2, 3
(input mode)
Bandgap reference with buffer voltage
BG
(for A/D type MCU Tiny Power IP)
Additional Power Consumption if Reference
with Buffer is used (for A/D type MCU)
Additional Power Consumption if LVR is used
(for Tiny Power IP)
Additional Power Consumption if LVD is used
(for Tiny Power IP)
LVR1
LVR2
Low Voltage Reset Voltage —
LVR3
LVR4
LVD1
LVD2
LVD3
LVD4
Low Voltage Detector Voltage —
LVD5
LVD6
LVD7
LVD8
Test Conditions
V
DD
3V
No load, All peripherals off
5V — — 2.5
No load, f
3V
f
off, ADC off, DAC off,
SYS
5V — 3.5 5.0
LVD/LVR disable, WDT enable,
Conditions
=4MHz (Crystal OSC)
OSC
2.2V
Min. Typ. Max. Unit
— —
1.5
— 1.5 2.5
DD
DD
— 6.0 —
VOL=0.4V
5.0V — 12.0 —
2.2V
VOH=0.9V
DD
— -1.0 —
-2.0 —
5.0V — -4.0 —
2.2V
VOH=0.9V
DD
— -40 —
5.0V — -160 —
5V VIN=0.4V — — -50 μA
5V VIN=2.4V — — -950 μA
5V 0.45V<VIN<VDD-0.3 — — ±10 μA
— — -3% 1.1 +3% V
— — — 200 300 μA
3V
LVR enable
5V — 75 100
3V
LVD enable
5V — 75 100
LVR Enable
, 2.1V select
LVR Enable, 2.55V select 2.55
LVR Enable, 3.15V select 3.15
—
—
-5%
75 100
75 100
2.1
+5% V
LVR Enable, 4.0V select 4.0
LVD Enable
, 2.0V Select
2.0
LVD Enable, 2.2V Select 2.2
LVD Enable, 2.4V Select 2.4
LVD Enable, 2.7V Select 2.7
LVD Enable, 3.0V Select 3.0
-5%.
+5% V
LVD Enable, 3.3V Select 3.3
LVD Enable, 3.6V Select 3.6
LVD Enable, 4.2V Select 4.2
μA
mA
D.C. Characteristics
V
V
mA3.3V — 9.0 —
mA3.3V —
μA3.3V — -80 —
μA
μA
Rev. 1.00 24 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
9
A.C. Characteristics
Symbol Parameter
f
SYS1
f
SYS2
f
LIRC
f
HIRC
f
TIMER
t
RES
System clock (Crystal OSC)
System clock (PLL) 4.5V~5.5V Crystal OSC=4MHz, PLL Enable 4 — 32 MHz
32kHz Internal RC oscillator
3.6864MHz Internal RC oscillator
Timer Input Frequency (T0~T3)
External Reset Minimum Low Pulse width — — 1 3.3 5 μs
System start-up timer period (Power-up or
t
SST
wake-up from Power-Down mode when
the main oscillator is off or system clock is
switching between HXT and HIRC)
t
RSTD
t
SRESET
t
HTO
t
INT
t
LVR
System Reset Delay Time (LVR reset) — — 16 32 64 ms
Software Reset Width to Reset — — 45 90 120 μs
HIRC Turn On Period 2.2V~5.5V HIRC OFF → ON — 200 — μs
External Interrupt Minimum Pulse Width —
Low Voltage Width to Reset — — 120 240 480 μs
Ta=25°C
Test Conditions
V
DD
Conditions
2.2V~5.5V
PLL Disable
4.5V~5.5V 0.4 — 24
5V Ta=25°C -10% 32 +10%
2.2V~5.5V Ta=-40°C~85°C -50% 32 +60%
Ta=25°C -3% 3.6864 +3%
3V
5V Ta=25°C -3% 3.6864 +3%
2.2V~5.5V f
4.5V~5.5V f
— f
=8MHz 0 — 2
SYS
=12MHz 0 — 3
SYS
=24MHz 0 — 6
SYS
=HXT or HIRC — 1024 — t
SYS
MCU is in Normal mode or Idle
mode
Min. Typ. Max. Unit
0.4 — 8
— 4 — t
MHz2.7V~5.5V 0.4 — 12
kHz
MHz
MHz2.7V~5.5V f
SYS
SYS
A.C. Characteristics
Rev. 1.00 25 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
10
Symbol Parameter
AV
V
V
DNL
INL
I
ADC
t
ADCK
t
ADC
t
ADS
t
ON2ST
A/D Converter Operating Voltage — — 2.7 — 5.5 V
DD
A/D Converter Input Voltage
ADI
A/D Converter Reference Voltage — — 2 — AVDDV
REF
Differential Non-linearity —
Integral Non-linearity —
Additional Power Consumption if A/D Converter is used
A/D Converter Clock Period — — 0.5 — 10 μs
A/D Conversion Time (Include Sample and Hold Time) — 12 bit ADC — 16 — t
A/D Converter Sampling Time — — — 4 — t
ADC on to ADC start — — 2 — — μs
ADC Electrical Characteristics
Ta=25°C
Test Conditions
AV
=5V
DD
V
=AV
REF
t
=1μs
ADCK
AVDD=5V
V
REF=AVDD
t
=1μs
ADCK
No load, t
Conditions
DD
=0.5μs
ADCK
V
DD
— VREF available 0 — V
— VREF not available 0 — AV
3V
5V — 1.30 2.00 mA
Min. Typ. Max. Unit
REF
DD
-2 — +2 LSB
-4 — +4 LSB
— 1.00 1.40 mA
ADCK
ADCK
ADC Electrical Characteristics
V
11
Static Performance
Resolution — 12 bits
Integral Nonlinearity — — ±2 — LSB
Differential Nonlinearity — — — ±1 LSB
Offset Error Data Word=0x014 — ±3 ±30 mV
Gain Error — — ±20 ±60 mV
Output Sink Current — — 300 — μA
Output Short-Circuit Current Data Word=0xFFF — 15 — mA
DAC Electrical Characteristics
VDD=3V, AV+=3.0V, V
Parameter Test Conditions Min. Typ. Max. Units
=2.4V, no output load unless otherwise specied
REF
Rev. 1.00 26 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
12
Symbol
—
—
—
V
CMPOS
V
HP1
V
HP2
V
HP3
V
HP4
V
HN1
V
HN2
V
HN3
V
HN4
V
CM
A
OL
t
PD
Note:
Comparator operating voltage — — 2.2 — 5.5 V
Comparator operating current 5V
Comparator power-down current 5V Comparator disable — — 0.1 μA
Comparator input offset voltage 5V — -10 — +10 mV
Positive Hysteresis 1 5V CP(n)HP[1:0]=00b — 0 1 mV
Positive Hysteresis 2 5V CP(n)HP[1:0]=01b 3 6 10 mV
Positive Hysteresis 3 5V CP(n)HP[1:0]=10b 6 13 20 mV
Positive Hysteresis 4 5V CP(n)HP[1:0]=11b 12 25 40 mV
Negative Hysteresis 1 5V CP(n)HN[1:0]=00b — 0 1 mV
Negative Hysteresis 2 5V CP(n)HN[1:0]=01b 3 6 10 mV
Negative Hysteresis 3 5V CP(n)HN[1:0]=10b 6 13 20 mV
Negative Hysteresis 4 5V CP(n)HN[1:0]=11b 12 25 40 mV
Comparator common mode voltage range — — VSS— VDD-1.4V V
Comparator open loop gain — — 60 80 — dB
Comparator response time
Measured with comparator one input pin at VCM=(VDD-1.4)/2 while the other pin input transition from VSS to
Comparator Electrical Characteristics
Parameter
Test Conditions
V
DD
LVDCR=00h, ADCR1=08h, i.e. select
internal bandgap voltage output (x2)
as VREFI
3V
With 100mV overdrive — 4 — μs
5V
Conditions
Min. Typ. Max.
— — 10 μA
(VCM +100mV) or from VDD to (VCM -100mV).
Ta=25°C
Unit
Comparator Electrical Characteristics
Rev. 1.00 27 of 225 January 15, 2015
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
13
Symbol Parameter
V
RR
t
POR
POR
VDD Start Voltage to ensure Power-on Reset — — — — 100 mV
VDD Rising Rate to ensure Power-on Reset — — 0.035 — — V/ms
POR
Minimum Time for VDD stays at V
Power-on Reset
Power on Reset Electrical Characteristics
to ensure
POR
Test Conditions
V
DD
— — 1 — — ms
Conditions
Min. Typ. Max. Unit
Ta=25°C
Power on Reset Electrical Characteristics
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System Architecture
A key factor in the high-performance features of the Holtek range of microcontrollers is attributed
to their internal system architecture. The range of devices take advantage of the usual features
found within 8051-based microcontrollers providing increased speed of operation and enhanced
performance. The pipelining scheme is implemented in such a way that instruction fetching and
instruction execution are overlapped, hence most instructions are effectively executed in one clock
cycle, with the exception of branch or call instructions. Compared with classic MCU architecture,
the 8051-based core runs at a much higher speed and with greatly reduced power consumption. An
8-bit wide ALU is used in practically all operations of the 8051 compatible instruction set. It carries
out arithmetic operations, logic operations, rotation, increment, decrement, branch decisions, etc.
The internal data path is simplied by moving data through the Accumulator and the ALU. Certain
internal registers are implemented in the Data Memory and can be directly or indirectly addressed.
The simple addressing methods of these registers along with additional architectural features
ensure that a minimum of external components is required to provide a functional I/O control
system with maximum reliability and exibility.
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
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During program execution, the Program Counter is used to keep track of the address of the
next instruction to be executed. It is automatically incremented by one each time an instruction
is executed except for instructions, such as “JMP” or “CALL” that demand a jump to a
non-consecutive Program Memory address.
When executing instructions requiring jumps to non-consecutive addresses such as a jump
instruction, a subroutine call, interrupt or reset, etc., the microcontroller manages program control
by loading the required address into the Program Counter. For conditional skip instructions, once
the condition has been met, the next instruction, which has already been fetched during the present
instruction execution, is discarded and a dummy cycle takes its place while the correct instruction
is obtained.
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This is a special part of the memory which is used to save the contents of the Program Counter
only. The stack is located in the 256 byte Data memory; therefore, the depth can be extended
up to 256 levels. The activated level is indexed by the Stack Pointer, SP, and is neither readable
nor writeable. At a subroutine call or interrupt acknowledge signal, the contents of the Program
Counter are pushed onto the stack. At the end of a subroutine or an interrupt routine, signaled by
a return instruction, RET or RETI, the Program Counter is restored to its previous value from the
stack. After a device reset, the Stack Pointer will point to the location 0x07, the top of the stack.
Note that if the data memory has been used as the stack area, it should not be used as general
purpose Data RAM.
Program Counter
Program Counter
Stack
Progra m Counte r
T op of S ta ck
Stack
Poin te r
Bottom o f Stack
Stack Block Diagram
If the stack is full and an enabled interrupt takes place, the interrupt request ag will be recorded
but the acknowledge signal will be inhibited. When the Stack Pointer is decremented, by RET or
RETI, the interrupt will be serviced. This feature prevents stack overow allowing the programmer
to use the structure more easily. However, when the stack is full, a CALL subroutine instruction
can still be executed which will result in a stack overow. Precautions should be taken to avoid
such cases which might cause unpredictable program branching.
Rev. 1.00 29 of 225 January 15, 2015
Stack Level 1
Stack Level 2
Stack Level 3
Stack Level 256
Progra m
Memory
Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
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The arithmetic-logic unit or ALU is a critical area of the microcontroller that carries out arithmetic
and logic operations of the instruction set. Connected to the main microcontroller data bus,
the ALU receives related instruction codes and performs the required arithmetic or logical
operations after which the result will be placed in the specied register. As these ALU calculation
or operations may result in carry, borrow or other status changes, the status register will be
correspondingly updated to reect these changes. The ALU supports the following functions:
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Arithmetic and Logic Unit – ALU
Arithmetic and Logic Unit – ALU
Arithmetic operations: ADD, ADDC, SUBB, DA, MUL, DIV
Logic operations: ANL, ORL, XRL, CLR, CPL
Rotation: RL, RLC, RR, RRC, SWAP
Increment and Decrement: INC, DEC
Branch decision: JC, JNC, JB, JNB, JBC, ACALL, LCALL, RET, RETI, AJMP, SJMP, JMP, JZ,
JNZ, CJNE, DJNZ
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