© INTEL C ORPORATION, 1997 November, 1997 Order Number: 273129-001
ADVANCE INFORMATION
8xC251TA/TB/TP/TQ
HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Commercial/Express
■ Real-time and Programmed Wait State
Bus Operation
■ Binary-code Compatible with MCS
®
51
■ Pin Compatible with 44-pin PLCC and
40-pin PDIP MCS 51 Sockets
■ Register-based MCS
®
251 Architect ure
— 40-byte Register File
— Registers Accessible as Bytes,
Words, or Double Words
■ Enriched MCS 51 Instruction Set
— 16-bit and 32-bit Arithmetic and
Logic Instructions
— Compare and Conditi onal Jump
Instructions
— Expanded Set of Move Instructions
■ Linear Addressing
■ 256-Kbyte Expa nded External
Code/Data Memory Space
■ ROM Options:
16 Kbytes (T B/TQ), 8 Kby tes (TA/ TP), or
without ROM
■ 16-bit Internal Code Fetch
■ 64-Kbyte Ext ended Stack Space
■ On-chip Data RAM Options:
1-Kbyte (TA/TB) or 512-Byte (TP/TQ)
■ 8-bit, 2-clock External Code Fet ch in
Page Mode
■ Fast MCS 251 Instruction Pipeline
■ User-selectable Configurations:
— External Wait States (0-3 wait
states)
— Address Range & Memory Mapping
—Page Mode
— Extended Data Float Timings or
8xC251Sx Compatible AC Timings
■ 32 Programmable I/O Lines
■ Eight Maskable Interrupt Sources with
Four Programmable Priority Levels
■ Three Flexible 16-bi t Timer/counters
■ Hardware Watchdog Timer
■ Programmable Counter Array
— High-speed Out put
— Compare/Capture Operation
— Pulse Width Modula tor
— Watchdog Timer
■ Two Program m able Serial I/O Ports
— Framing Error Detection
— Automatic Addr ess Recognition
■ High-performance CHMOS Technology
■ Static Standby to 24-MHz Operation
■ Complete System Development
Support
— Compatible wi th Exi sti ng Tools
— MCS 251 Tools Available:
Compiler, Assembler, Debugger,
ICE
■ Package O ptions (PDIP and PLCC)
Information in this document is provided in connection with Intel products. No license, express or implied, by
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Desi gners mu st not rely on the absence or characteristics of any feat ures or instructions marked "reserved" or
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incompatibilities arising from future changes to them.
The 8xC 251TA /TB/TP/TQ may contain design defects or errors known as er rata which may cause the product
to deviat e from published specifi c ations. Current characterized errata are avail able on request.
Copies of documents which have an ordering number and are referenced in this document, or other Intel
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Copyright © Intel Corporation 1997.
*Third party brands and names are the property of their respective owners.
Contents
ADVANCE INFORMATION iii
8xC251TA/TB/TP/TQ
HIGH-PERFORMANCE CHMOS Microcontroller
Commercial/Express
1.0 INTROD UC TION .... ... .... ............ .... ... .... .... ....................... .... .... ... .... ................................... ... .... .... .... ........... 1
2.0 NOMENC LA TUR E ........ ....................... .... .... .... ... ....................... .... .... .... .... .................................. .... .... ... .... 2
3.0 PINOUT ..................... .... .... .... .... ....................... ... .... .... .... .................................. .... .... .... .... ...................... .... 4
4.0 SIGNALS .... .... ....................... .... .... ... .... ....................... .... .... .... ... ................................... .... ... .... .... ............... 8
5.0 ADDRESS MAP ........................................................................................................................................ 11
6.0 ELECTRIC AL C HAR ACT ER IST ICS ........ .... ........... .... .... .... .... .................................. .... .... ... .... ................. 1 2
6.1 D.C. Charac te ris ti cs ... .... ....................... .... ... .... .... ....................... .... .... ... .... ................................... ... .. 12
6.2 Definition of AC Symbols ................................................................................................................... 14
6.3 A.C. Characte ris ti cs ....... .... .... .................................. .... .... ... .... ....................... .... .... .... ... ..................... 14
6.3.1 External Bus Cycles, Nonpage Mode ..................................................................................... 18
6.3.2 External Bus Cycles, Page Mode ...........................................................................................21
6.3.3 Definition of Real-Time Wait Symbols ....................................................................................24
6.3.4 External Bus Cycles, Real-Time Wait States ..........................................................................24
6.4 AC Characteristics — Serial Port, Shift Register Mode ..................................................................... 28
6.5 External Clock Drive .......................................................................................................................... 29
7.0 THERMAL CHARACTERISTICS .............................................................................................................. 30
Contents
iv ADVANCE INFORMATION
FIGURES
Figure 1. 8xC251TA/TB/TP/TQ Block Diagram ........................................................................................ 1
Figure 2. The 8xC251TA/TB/TP/TQ Family Nomenclature....................................................................... 2
Figure 3. 8xC2 51 TA/TB/TP/TQ 44 -pi n PLCC Pack ag e ............ .... .... ... ....................... .... .... .... .... .............. 4
Figure 4. 8xC2 51 TA/TB/TP/TQ 40 -pi n PDIP Pac k ag es ............ .... .... ... .... ................................... ... .... .... ... 5
Figure 5. External Bus Cycle: Code Fetch (Nonpage Mode).................................................................. 18
Figure 6. External Bus Cycle: Data Read (Nonpage Mode) ................................................................... 19
Figure 7. External Bus Cycle: Data Write (Nonpage Mode).................................................................... 20
Figure 8. External Bus Cycle: Code Fetch (Page Mode) ........................................................................ 21
Figure 9. External Bus Cycle: Data Read (Page Mode).......................................................................... 22
Figure 10. External Bus Cycle: Data Write (Page Mode).......................................................................... 23
Figure 11. External Bus Cycle: Code Fetch/Data Read (Nonpage Mode)................................................ 24
Figure 12. External Bus Cycle: Data Write (Nonpage Mode).................................................................... 25
Figure 13. External Bus Cycle: Code Fetch/Data Read (Page Mode)...................................................... 26
Figure 14. External Bus Cycle: Data Write (Page Mode).......................................................................... 27
Figure 15. Serial Port Waveform — Shift Register Mode.......................................................................... 28
Figure 16. External Clock Drive Waveforms ............................................................................................. 29
Figure 17. AC Testing Input, Output Waveforms ...................................................................................... 29
Figure 18. Float Waveforms...................................................................................................................... 30
TABLES
Table 1. Descrip tio n of Pro du ct Nome nc la tu re ........... .... .... .... .... .................................. .... .... .... ... ............2
Table 2. Proliferation Options ..................................................................................................................3
Table 3. Package Information ..................................................................................................................3
Table 4. 8xC251TA/TB/TP/TQ Pin Assignment .......................................................................................6
Table 5. 8xC251 TA/T B/T P/TQ PLCC/DIP Pin Assignm ents Arranged by Func tiona l Cate g ory .. .... .... ....7
Table 6. Signal Descriptions ....................................................................................................................8
Table 7. Memory Signal Selections (RD1:0) ..........................................................................................10
Table 8. 8xC251TA/TB/TP/TQ Address Map .........................................................................................11
Table 9. DC Characteris tics at V
CC
= 4.5 – 5.5 V ..................................................................................12
Table 10. AC Timing Symbol Definitions .................................................................................................14
Table 11. AC Characteristics ...................................................................................................................14
Table 12. Real-time Wait Timing Symbol Definitions ...............................................................................24
Table 13. Rea l-T ime Wa it AC Timin g ........ .... .... .... ....................... .... ... .... .... .................................. .... .... ..27
Table 14. Serial Port Timing — Shift Register Mode ...............................................................................28
Table 15. External Clock Drive ................................................................................................................29
Table 16. Thermal Characteristics ...........................................................................................................30
ADVANCE INFORMATION 1
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
1.0 INTRODUCTION
A member of the Intel family of 8-bit MCS 251 microcontrollers, the 8xC251TA/TB/TP/TQ is binary-code
compatible with MCS 51 microcontrollers and pin
compatible with 40-pin PDIP and 44-pin PLCC
MCS 51 microcontrollers. MCS 251 microcontrollers
feature an enriched instruction set, linear
addressing, and efficient C-language support. The
8xC251TA/TB/TP/TQ has 512 bytes or 1 Kbyte of
on-chip RAM and is available with 8 Kbytes or 16
Kbytes of on-chip ROM, or without ROM. A variety of
featu res ca n be selected by n ew user-programmab le
configurations.
Figure 1. 8xC251TA/TB/TP/TQ Block Diagram
A4530-01
SRC2 (8)
Code Address (24)
Clock & Reset
Code Bus (16)
Data RAM
512 Bytes
or
1024 Bytes
Code
OTPROM/ROM
8 Kbytes
or
16 Kbytes
Watchdog
Timer
Timer/
Counters
PCA
Two
Serial I/O
Ports
Peripherals
Port 2
Drivers
P2.7:0
Port 0
Drivers
P0.7:0
Port 3
Drivers
P3.7:0
Port 1
Drivers
P1.7:0
Data Address (24)
Data Bus (8)
Memory Address (16)
MCS
®
251 Microcontroller Core
System Bus and I/O Ports
I/O Ports and
Peripheral Signals
SRC1 (8)
IB Bus (8)
Peripheral
Interface
Interrupt
Handler
Clock
&
Reset
Bus Interface
Instruction Sequencer
DST (16)
ALU
Data
Memory
Interface
Memory Data (16)
Register
File
8XC251TA/TB/TP/TQ Microcontroller
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
2
ADVANCE INFORMATION
2.0 NOMENCLATURE
Figure 2. The 8xC251TA/TB/TP/TQ Family Nomenclature
Table 1. Description of Product Nomenclature
Parameter Options Description
Temper ature and Burn-in
Options
no mark Commercial operating temperature range (0°C to 70°C) with
Intel standard burn-in.
T Express oper ating tempera ture range (-4 0°C to 85°C)
without Intel stan dard burn-in.
Packaging Options N 44-pin Plastic Lea ded Chip Carrier (PLCC)
P 40-pin Plastic Dual I n-lin e Package (PDIP)
C 40-pin Cerami c Dual In- line P ackage (Ceramic DIP)
Program Memory Options 0 Without ROM
3ROM
Process Information C CHMOS
Product Family 251 8-bit control architecture
Device Memory Options TA 1-Kbyte RAM/8-Kbyte ROM
TB 1-Kbyte RAM/16-Kbyte ROM or without ROM
TP 512-byte RAM/8-Kbyte ROM
TQ 512-byte RAM/16-Kbyte ROM or without ROM
Device Speed 24 External clo ck frequency
Program-memory Options
XXXXX XXXX8XXX
Packaging Options
Temperature and Burn-in Options
A2815-01
Process Information
Product Family
Device Speed
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
ADVANCE INFORMATION 3
Table 2 lists the proliferation options. See Figure 2 for the 8xC251TA/TB/TP/TQ family nomenclature.
Table l ists the 8xC251TA/TB/TP /TQ package definitions.
Table 2. Proliferation Options
8xC251TA/TB/TP/TQ
(0 – 24 MHz; 5 V ±10%)
80C251TB24 CPU-only
80C251TQ24 CPU-only
83C251TA24 ROM
83C251TB24 ROM
83C251TP24 ROM
83C251TQ24 ROM
Table 3. Pa ck ag e Inf orm ation
Pkg. Definition Temperature
N44 ld. PLCC 0°C to +70°C
P 40 ld. Plastic DIP 0°C to +70°C
TN 44 ld. PLCC -40°C to +85°C
TP 40 ld. Plastic DIP -40°C to +85°C
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
4
ADVANCE INFORMATION
3.0 PINOUT
Figure 3. 8xC251TA/TB/TP/TQ 44-pin PLCC Package
A4538-01
AD4 / P0.4
AD5 / P0.5
AD6 / P0.6
AD7 / P0.7
EA#
V
SS2
ALE
PSEN#
A15 / P2.7
A14 / P2.6
A13 / P2.5
P1.4 / CEX1
P1.3 / CEX0 / TXD1
P1.2 / ECI / RXD1
P1.1 / T2EX
P1.0 / T2
V
SS1
V
CC
AD0 / P0.0
AD1 / P0.1
AD2 / P0.2
AD3 / P0.3
P1.5 / CEX2
P1.6 / CEX3 / WAIT#
P1.7 / CEX4 / A17 / WCLK
RST
P3.0 / RXD
V
CC2
P3.1 / TXD
P3.2 / INT0#
P3.3 / INT1#
P3.4 / T0
P3.5 / T1
39
38
37
36
35
34
33
32
31
30
29
8XC251TA
8XC251TB
8XC251TP
8XC251TQ
View of component as
mounted on PC board
7
8
9
10
11
12
13
14
15
16
17
P3.6 / WR#
P3.7 / RD# / A16
XTAL2
XTAL1
V
SS
V
SS2
A8 / P2.0
A9 / P2.1
A10 / P2.2
A11 / P2.3
A12 / P2.4
18
19
20
21
22
23
24
25
26
27
28
65432
1
44
43
42
41
40
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
ADVANCE INFORMATION 5
Figure 4. 8xC251TA/TB/TP/TQ 40-pin PDIP Packages
A4532-02
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
V
CC
AD0 / P0.0
AD1 / P0.1
AD2 / P0.2
AD3 / P0.3
AD4 / P0.4
AD5 / P0.5
AD6 / P0.6
AD7 / P0.7
EA#
ALE
PSEN#
A15 / P2.7
A14 / P2.6
A13 / P2.5
A12 / P2.4
A11 / P2.3
A10 / P2.2
A9 / P2.1
A8 / P2.0
P1.0 / T2
P1.1 / T2EX
P1.2 / ECI / RXD1
P1.3 / CEX0 / TXD1
P1.4 / CEX1
P1.5 / CEX2
P1.6 / CEX3 / WAIT#
P1.7 / CEX4 / A17 / WCLK
RST
P3.0 / RXD
P3.1 / TXD
P3.2 / INT0#
P3.3 / INT1#
P3.4 / T0
P3.5 / T1
P3.6 / WR#
P3.7 / RD# / A16
XTAL2
XTAL1
V
SS
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
8XC251TA
8XC251TB
8XC251TP
8XC251TQ
View of
component
as mounted
on PC board
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
6
ADVANCE INFORMATION
Table 4. 8xC251TA/TB/TP/TQ Pin Assignment
PLCC DIP Name PLCC DIP Name
1
V
SS1
23 V
SS2
2 1 P1.0/T2 24 21 A8/P2.0
3 2 P1.1/T2EX 25 22 A9/P2.1
4 3 P1.2/ECI/RXD1 26 23 A10/P2.2
5 4 P1.3/CEX0/TXD1 27 24 A11/P2.3
6 5 P1.4/CEX1 28 25 A12/P2.4
7 6 P1.5/CEX2 29 26 A13/P2.5
8 7 P1.6/CEX3/WAIT# 30 27 A14/P2.6
9 8 P1.7/CEX4/A17/WCLK 31 28 A15/P2.7
10 9 RST 32 29 PSEN#
11 10 P3.0/RXD 33 30 ALE
12
V
CC2
34 V
SS2
13 11 P3.1/TXD 35 31 EA#
14 12 P3.2/INT0# 36 32 AD7/P0.7
15 13 P3.3/INT1# 37 33 AD6/P0.6
16 14 P3.4/T0 38 34 AD5/P0.5
17 15 P3.5/T1 39 35 AD4/P0.4
18 16 P3.6/WR# 40 36 AD3/P0.3
19 17 P3.7/RD#/A16 41 37 AD2/P0.2
20 18 XTAL2 42 38 AD1/P0.1
21 19 XTAL1 43 39 AD0/P0.0
22 20 V
SS
44 40 V
CC
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
ADVANCE INFORMATION 7
Table 5. 8xC251TA/TB/TP/TQ PLCC/DIP Pin Assignments Arranged by Functional Category
Address & Data Input/Output
Name PLCC DIP Name PLCC DIP
AD0/P0.0 43 39 P1.0/T2 2 1
AD1/P0.1 42 38 P1.1/T2EX 3 2
AD2/P0.2 41 37 P1.2/ECI/RXD1 4 3
AD3/P0.3 40 36 P1.3/CEX0/TXD1 5 4
AD4/P0.4 39 35 P1.4/CEX1 6 5
AD5/P0.5 38 34 P1.5/CEX2 7 6
AD6/P0.6 37 33 P1.6/CEX3/WAIT# 8 7
AD7/P0.7 36 32 P1.7/CEX4/A17/WCLK 9 8
A8/P2.0 24 21 P3.0/RXD 11 10
A9/P2.1 25 22 P3.1/TXD 13 11
A10/P2.2 26 23 P3.4/T0 16 14
A11/P2.3 27 24 P3.5/T1 17 15
A12/P2.4 28 25
A13/P2.5 29 26 Power & Ground
A14/P2.6 30 27 Name PLCC DIP
A15/P2.7 31 28 V
CC
44 40
P3.7/RD#/A16 19 17 V
CC2
12
P1.7/CEX4/A17/WCLK 9 8 V
SS
22 20
V
SS1
1
V
SS2
23, 34
Proc es sor C ont r ol EA# 35 31
Name PLCC DIP
P3.2/INT0# 14 12 Bus Control & Status
P3.3/INT1# 15 13 Name PLCC DIP
EA# 35 31 P3.6/WR# 18 16
RST 10 9 P3.7/RD#/A16 19 17
XTAL1 21 18 ALE 33 30
XTAL2 20 19 PSEN# 32 29
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