Datasheet 80c575, 83c575, 87c575 DATASHEETS

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Page 1

INTEGRATED CIRCUITS

80C575/83C575/87C575

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

Product specification Supersedes data of 1998 Jan 27 IC20 Data Handbook

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1998 May 01

Page 2

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

DESCRIPTION

The Philips 80C575/83C575/87C575 is a high-performance microcontroller fabricated with Philips high-density CMOS technology. The Philips CMOS technology combines the high speed and density characteristics of HMOS with the low power attributes of CMOS. Philips epitaxial substrate minimizes latch-up sensitivity.

The 8XC575 contains an 8k × 8 ROM (83C575) EPROM (87C575), a 256 × 8 RAM, 32 I/O lines, three 16-bit counter/timers, a Programmable Counter Array (PCA), a seven-source, two-priority level nested interrupt structure, an enhanced UART, four analog comparators, power-fail detect and oscillator fail detect circuits, and on-chip oscillator and clock circuits.

In addition, the 8XC575 has a low active reset, and the port pins are reset to a low level. There is also a fully configurable watchdog timer, and internal power on clear circuit. The part includes idle mode and power-down mode states for reduced power consumption.

FEA TURES

•80C51 based architecture

– 8k × 8 ROM (83C575) – 8k × 8 EPROM (87C575) – ROMless (80C575) – 256 × 8 RAM – Three 16-bit counter/timers – Programmable Counter Array – Enhanced UART – Boolean processor – Oscillator fail detect – Low active reset – Asynchronous low port reset – Schmitt trigger inputs – 4 analog comparators – Watchdog timer – Low V

detect

•Memory addressing capability

– 64k ROM and 64k RAM

•Power control modes:

– Idle mode – Power-down mode

•CMOS and TTL compatible

•4.0 to 16MHz

•Extended temperature ranges

•OTP package available

80C575/83C575/

PIN CONFIGURATIONS

CMP0+/P1.0/T2

CMP0-/P1.1/T2EX

ECI/P1.2

CMP0/CEX0/P1.3 CMP1/CEX1/P1.4

CMP2/CEX2/P1.5 CMP3/CEX3/P1.6

CEX4/P1.7

RxD/P3.0

TxD/P3.1 INT0 INT1/P3.3

CMPR-/T0/P3.4

CMP1+/T1/P3.5

CMP2+/WR

CMP3+/RD/P3.7

18 28

1 2 3

4 5

6 7 8

RST

9 10 11 12

/P3.2

13 14 15

/P3.6

16 17

XTAL2

XTAL1

19 20

644140

LCC

DUAL

IN-LINE

PACKAGE

87C575

P0.0/AD0

P0.1/AD1

P0.2/AD2

P0.3/AD3

P0.4/AD4

P0.5/AD5

P0.6/AD6

P0.7/AD7

EA/V

ALE/PROG

PSEN

P2.7/A15

P2.6/A14

P2.5/A13

P2.4/A12

P2.3/A11

P2.2/A10

P2.1/A9

P2.0/A8

PQFP

SU00234

ORDERING INFORMA TION

ROMless ROM EPROM

TEMPERATURE RANGE °C AND PACKAGE

FREQ (MHz)

P80C575EBPN P83C575EBPN P87C575EBPN OTP 0 to +70, 40-Pin Plastic Dual In-line Package 16 SOT129-1 P80C575EBAA P83C575EBAA P87C575EBAA OTP 0 to +70, 44-Pin Plastic Leaded Chip Carrier 16 SOT187-2 P80C575EHAA P83C575EHAA P87C575EHAA OTP –40 to +125, 44-Pin Plastic Leaded Chip Carrier 16 SOT187-2 P80C575EBBB P83C575EBBB P87C575EBBB OTP 0 to +70, 44-Pin Plastic Quad Flat Pack 16 SOT307-2

NOTE:

1. OTP - One Time Programmable EPROM.

1998 May 01 853-1684 19332

DRAWING

NUMBER

Page 3

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

BLOCK DIAGRAM

P0.0-P0.7 P2.0-P2.7

PORT 0

DRIVERS

RAM ADDR REGISTER

RAM

ACC

TMP2

PORT 0

LATCH

TMP1

PORT 2

DRIVERS

PORT 2

LATCH

STACK

POINTER

ROM/

EPROM

80C575/83C575/

87C575

PROGRAM

ADDRESS REGISTER

PSEN

ALE

RST

TIMING

AND

CONTROL

OSCILLATOR

XTAL1 XTAL2

INSTRUCTION

PSW

PORT 1

LATCH

PORT 1

DRIVERS

P1.0-P1.7

ALU

SFRs

TIMERS

PCA

PORT 3

LATCH

PORT 3

DRIVERS

P3.0-P3.7

BUFFER

INCRE-

MENTER

PROGRAM

COUNTER

DPTR

SU00238

1998 May 01

Page 4

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

CERAMIC AND PLASTIC LEADED CHIP CARRIER PIN FUNCTIONS

6140

LCC

18 28

Pin Function

1 NC* 2 T2/P1.0/CMP0+ 3 T2EX/P1.1/CMP0– 4 P1.2/ECI 5 P1.3/CMP0/CEX0 6 P1.4/CMP1/CEX1 7 P1.5/CMP2/CEX2 8 P1.6/CMP3/CEX3

9 P1.7/CEX4 10 RST 11 RxD/P3.0 12 NC* 13 TxD/P3.1 14 INT

0/P3.2 1/P3.3

15 INT 16 T0/P3.4/CMPR– 17 T1/P3.5/CMP1+

/P3.6/CMP2+

18 WR 19 RD

/P3.7/CMP3+ 20 XTAL2 21 XTAL1 22 V

* NO INTERNAL CONNECTION

Pin Function

23 NC* 24 P2.0/A8 25 P2.1/A9 26 P2.2/A10 27 P2.3/A11 28 P2.4/A12 29 P2.5/A13 30 P2.6/A14 31 P2.7/A15 32 PSEN 33 ALE/PROG 34 NC*

35 EA

36 P0.7/AD7 37 P0.6/AD6 38 P0.5/AD5 39 P0.4/AD4 40 P0.3/AD3 41 P0.2/AD2 42 P0.1/AD1 43 P0.0/AD0 44 V

SU00235

PLASTIC QUAD FLAT PACK PIN FUNCTIONS

44 34

PQFP

12 22

Pin Function

1 P1.5/CMP2/CEX2 2 P1.6/CMP3/CEX3 3 P1.7/CEX4 4 RST 5 RxD/P3.0 6 NC* 7 TxD/P3.1

0/P3.2

8 INT 9 INT

1/P3.3 10 T0/P3.4/CMPR– 11 T1/P3.5/CMP1+

/P3.6/CMP2+

12 WR

/P3.7CMP3+

13 RD 14 XTAL2 15 XTAL1 16 V

17 NC* 18 P2.0/A8 19 P2.1/A9 20 P2.2/A10 21 P2.3/A11 22 P2.4/A12

* NO INTERNAL CONNECTION

Pin Function

23 P2.5/A13 24 P2.6/A14 25 P2.7/A15 26 PSEN 27 ALE/PROG 28 NC* 29 EA

30 P0.7/AD7 31 P0.6/AD6 32 P0.5/AD5 33 P0.4/AD4 34 P0.3/AD3 35 P0.2/AD2 36 P0.1/AD1 37 P0.0/AD0 38 V

39 NC* 40 T2/P1.0/CMP0+ 41 T2EX/P1.1/CMP0– 42 P1.2/ECI 43 P1.3/CMP0/CEX0 44 P1.4/CMP1/CEX1

SU00236

80C575/83C575/

87C575

LOGIC SYMBOL

CMPR–

CMP1+ CMP2+ CMP3+

1998 May 01

EA/V

PSEN

ALE/PROG RxD TxD

INT0 INT1

T0 T1

SECONDARY FUNCTIONS

XTAL1

XTAL2

RST

PORT 3

ADDRESS AND

PORT 1PORT 2

DATA BUS

T2 T2EX

ADDRESS BUS

CMP0+ CMP0– ECI CMP0/CEX0 CMP1/CEX1 CMP2/CEX2 CMP3/CEX3 CEX4

SU00237

PORT 0

Page 5

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

80C575/83C575/

87C575

PIN DESCRIPTIONS

PIN NUMBER

MNEMONIC DIP LCC QFP TYPE NAME AND FUNCTION

P0.0-0.7 39-32 43-36 37-30 I/O Port 0: Port 0 is an open-drain bidirectional I/O port. Port 0 pins that have 1s written to them

P1.0-P1.7 1-8 2-9 40-44

P2.0-P2.7 21-28 24-31 18-25 I/O Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s

P3.0-P3.7 10-17 11,

20 22 16 I Ground: 0V reference. 40 44 38 I Power Supply: This is the power supply voltage for normal, idle, and power-down

1-3

1 2 40 I/O P1.0 T2 Timer 2 external I/O – clockout (programmable) 2 3 41 I P1.1 T2EX Timer 2 capture input 3 4 42 I P1.2 ECI PCA count input

4 5 43 I/O P1.3 CEX0 PCA module 0 external I/O 5 6 44 I/O P1.4 CEX1 PCA module 1 external I/O 6 7 1 I/O P1.5 CEX2 PCA module 2 external I/O 7 8 2 I/O P1.6 CEX3 PCA module 3 external I/O 8 9 3 I/O P1.7 CEX4 PCA module 4 external I/O

13-195,7-13

operation.

float and can be used as high-impedance inputs. Port 0 is also the multiplexed low-order address and data bus during accesses to external program and data memory. In this application, it uses strong internal pull-ups when emitting 1s. Port 0 also receives code bytes during EPROM programming and outputs code bytes during program verification. External pull-ups are required during program verification. During reset, port 0 will be asynchronously driven low and will remain low until written to by software. All port 0 pins have Schmitt trigger inputs with 200mV hysteresis. A weak pulldown on port 0 guarantees positive leakage current (see DC Electrical Characteristics: I

I/O Port 1: Port 1 is an 8-bit bidirectional I/O port. Port 1 pins have internal pull-ups such that

pins that have 1s written to them can be used as inputs but will source current when externally pulled low (see DC Electrical Characteristics: I address byte during program memory verification and EPROM programming. During reset, port 1 will be asynchronously driven low and will remain low until written to by software. All port 1 pins have Schmitt trigger inputs with 50mV hysteresis. Port 1 pins also serve alternate functions as follows:

CMP0+ Comparator 0 positive input CMP0- Comparator 0 negative input

CMP0 Comparator 0 output CMP1 Comparator 1 output CMP2 Comparator 2 output CMP3 Comparator 3 output

written to them can be used as inputs, but will source current when externally pulled low (see DC Electrical Characteristics: I accesses to external program and data memory that use 16-bit addresses (MOVX @DPTR). In this application, it uses strong internal pull-ups when emitting 1s. Port 2 receives the high-order address byte during program verification and EPROM programming. During reset, port 2 will be asynchronously driven low and will remain low until written to by software. Port 2 can be made open drain by writing to the P2OD register (AIH). In open drain mode, weak pulldowns on port 2 guarantee positive leakage current (see DC Electrical Characteristics I

I/O Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins except P3.1

that have 1s written to them can be used as inputs but will source current when externally pulled low (see DC Electrical Characteristics: I while transmitting serial data, in which case the strong pull-up will remain on continuously when outputting a 1 level. The P3.1 output drive level when transmitting can be set to one of two levels by the writing to the P3.1 register bit. During reset all pins (except P3.1) will be asynchronously driven low and will remain low until written to by software. All port 3 pins have Schmitt trigger inputs with 200mV hysteresis, except P3.2 and P3.3, which have 50mV hysteresis. Port 3 pins serve alternate functions as follows:

). Port 2 emits the high-order address byte during

). P3.1 will be a high impedance pin except

). Port 1 receives the low-order

1998 May 01

Page 6

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

80C575/83C575/

87C575

PIN DESCRIPTIONS (Continued)

PIN NUMBER

MNEMONIC DIP LCC QFP TYPE NAME AND FUNCTION

Port 3: (continued)

10 11 5 I P3.0 RxD Serial receive port

11 13 7 O P3.1 TxD Serial transmit port enabled only when transmitting serial data 12 14 8 I P3.2 INT0 External interrupt 0 13 15 9 I P3.3 INT1 External interrupt 1 14 16 10 I P3.4 T0 Timer/counter 0 input

15 17 11 I P3.5 T1 Timer/counter 1 input 16 18 12 O P3.6 WR External data memory write strobe 17 19 13 O P3.7 RD External data memory read strobe

RST 9 10 4 I Reset: A low on this pin asynchronously resets all port pins to a low state except P3.1. The

ALE/PROG 30 33 27 I/O Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the

PSEN 29 32 26 O Program Store Enable: The read strobe to external program memory. When the device is

EA/V

XTAL1 19 21 15 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator

XTAL2 18 20 14 O Crystal 2: Output from the inverting oscillator amplifier.

31 35 29 I External Access Enable/Programming Supply Voltage: EA must be externally held low

CMPR- Common - reference to comparators 1, 2, 3 CMP1+ Comparator 1 positive input CMP2+ Comparator 2 positive input CMP3+ Comparator 3 positive input

pin must be held low with the oscillator running for 24 oscillator cycles to initialize the internal registers. An internal diffused resistor to V an external capacitor to V noise immunity with a slow rising input voltage.

address during an access to external memory. In normal operation, ALE is emitted at a constant rate of 1/6 the oscillator frequency, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. ALE is switched off if the bit 0 in the AUXR register (8EH) is set. This pin is also the program pulse input (PROG

executing code from the external program memory, PSEN is activated twice each machine cycle, except that two PSEN memory. PSEN

to enable the device to fetch code from external program memory locations 0000H to 1FFFH. If EA program counter contains an address greater than 1FFFH. This pin also receives the

12.75V programming supply voltage (V

circuits.

) during EPROM programming.

is not activated during fetches from internal program memory.

is held high, the device executes from internal program memory unless the

. RST has a Schmitt trigger input stage to provide additional

activations are skipped during each access to external data

) during EPROM programming.

permits a power on reset using only

1998 May 01

Page 7

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

80C575/83C575/

87C575

Table 1. 87C575 Special Function Registers

SYMBOL DESCRIPTION

ACC* Accumulator E0H E7 E6 E5 E4 E3 E2 E1 E0 00H AUXR# Auxiliary 8EH – – – – – – LO AO xxxxxx00B B* B register F0H F7 F6 F5 F4 F3 F2 F1 F0 00H CCAP0H# Module 0 Capture High FAH xxxxxxxxB

CCAP1H# Module 1 Capture High FBH xxxxxxxxB CCAP2H# Module 2 Capture High FCH xxxxxxxxB CCAP3H# Module 3 Capture High FDH xxxxxxxxB CCAP4H# Module 4 Capture High FEH xxxxxxxxB CCAP0L# Module 0 Capture Low EAH xxxxxxxxB CCAP1L# Module 1 Capture Low EBH xxxxxxxxB CCAP2L# Module 2 Capture Low ECH xxxxxxxxB CCAP3L# Module 3 Capture Low EDH xxxxxxxxB CCAP4L# Module 4 Capture Low EEH xxxxxxxxB

CCAPM0# Module 0 Mode DAH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B CCAPM1# Module 1 Mode DBH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B CCAPM2# Module 2 Mode DCH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B CCAPM3# Module 3 Mode DDH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B CCAPM4# Module 4 Mode DEH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B

DIRECT

ADDRESS

BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION MSB LSB

RESET VALUE

DF DE DD DC DB DA D9 D8

CCON*# PCA Counter Control D8H CF CR – CCF4 CCF3 CCF2 CCF1 CCF0 00x00000B CH# PCA Counter High F9H 00H CL# PCA Counter Low E9H 00H

CMOD# PCA Counter Mode D9H CIDL WDTE – – – CPS1 CPS0 ECF 00xxx000B

EF EE ED EC EB EA E9 E8 CMP*# Comparator E8H EC3DP EC2DP EC1DP EC0DP C3RO C2RO C1RO C0RO 00H CMPE# Comparator Enable 91H

DPTR: Data Pointer (2 bytes) DPH Data Pointer High 83H 00H DPL Data Pointer Low 82H 00H

IE* Interrupt Enable A8H EA EC ET2 ES ET1 EX1 ET0 EX0 00H

IP* Interrupt Priority B8H – PPC PT2 PS PT1 PX1 PT0 PX0 x0000000B

P0* Port 0 80H AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 00H

P1* Port 1 90H CEX4 CEX3 CEX2 CEX1 CEX0 EXI T2EX T2 00H

P2* Port 2 A0H AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 00H

P3* Port 3 B0H RD WR T1 T0 INT1 INT0 TxD RxD 00H

* SFRs are bit addressable. # SFRs are modified from or added to the 80C51 SFRs.

1. 87C575 only.

EC3TDC EC2TDC EC1TDC EC0TDC EC3OD EC2OD EC1OD EC0OD

AF AE AD AC AB AA A9 A8

BF BE BD BC BB BA B9 B8

87 86 85 84 83 82 81 80

97 96 95 94 93 92 91 90

A7 A6 A5 A4 A3 A2 A1 A0

B7 B6 B5 B4 B3 B2 B1 B0

00H

1998 May 01

Page 8

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

80C575/83C575/

87C575

Table 1. 87C575 Special Function Registers (Continued)

SYMBOL DESCRIPTION

P2OD# Port 2 Pullup Disable A1H 00H

PCON# Power Control 87H

PSW* Program Status Word D0H CY AC F0 RS1 RS0 OV – P 00H RACAP2H#

RACAP2L

SADDR# Slave Address A9H 00H SADEN# Slave Address Mask B9H 00H

SBUF Serial Data Buffer 99H xxxxxxxxB

SCON* Serial Control 98H SM0 SM1 SM2 REN TB8 RB8 TI RI 00H SP Stack Pointer 81H 07H

TCON* Timer Control 88H TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 00H

Timer 2 Capture High CBH 00H

# Timer 2 Capture Low CAH 00H

DIRECT

ADDRESS

BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION MSB LSB

SMOD1 SMOD0

D7 D6 D5 D4 D3 D2 D1 D0

9F 9E 9D 9C 9B 9A 99 98

8F 8E 8D 8C 8B 8A 89 88

OSF1POF

LVF

GF0 PD IDL 00xxx000B

RESET VALUE

CF CE CD CC CB CA C9 C8 T2CON* Timer 2 Control C8H TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2 00H T2MOD# Timer 2 Mode Control C9H – – – – – – T2OE2DCEN xxxxxxx0B

TH0 Timer High 0 8CH 00H TH1 Timer High 1 8DH 00H TH2# Timer High 2 CDH 00H TL0 Timer Low 0 8AH 00H TL1 Timer Low 1 8BH 00H TL2# T imer Low 2 CCH 00H

TMOD Timer Mode 89H GA TE C/T M1 M0 GA TE C/T M1 M0 00H

C7 C6 C5 C4 C3 C2 C1 C0 WDCON*#Watchdog Timer Control WDL#

WFEED1# Watchdog Feed 1 C2H xxH WFEED2# Watchdog Feed 2 C3H xxH

* SFRs are bit addressable. # SFRs are modified from or added to the 80C51 SFRs.

1. Reset value depends on reset source.

2. Programmable clock-out.

Watchdog Timer Reload

C0H PRE2 PRE1 PRE0 LVRE OFRE C1H 00H

WDRUN WDTOF WDMOD

11111101B

1998 May 01

Page 9

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

POWER ON CLEAR/ POWER ON FLAG

An on-chip Power On Detect Circuit resets the 8XC575 and sets the Power Off Flag (PCON.4) on power up or if V

drops to

zero momentarily. The POF can only be cleared by software. The RST pin is not driven by the power on detect circuit. The POF can be read by software to determine that a power failure has occurred and can also be set by software.

LOW VOLTAGE DETECT

An on-chip Low Voltage Detect circuit sets the Low Voltage Flag (PCON.3) if V below V

(see DC Electrical

LOW

Characteristics) and resets the 8XC575 if the Low Voltage Reset Enable bit (WDCON.4) is set. If the LVRE is cleared, the reset is disabled but LVF will still be set if V The RST pin is not driven by the low voltage detect circuit. The LVF can be read by software to determine that V

LVF can be set or cleared by software.

drops

is low.

was low. The

OSCILLATOR FAIL DETECT

An on-chip Oscillator Fail Detect circuit sets the Oscillator Fail Flag (PCON.5) if the oscillator frequency drops below OSCF for one or more cycles (see AC Electrical Characteristics: OSCF) and resets the 8XC575 if the Oscillator Fail Reset Enable bit (WDCON.3) is set. If OFRE is cleared, the reset is disabled but OSF will still be set if the oscillator fails. The RST pin is not driven by the oscillator fail detect circuit. The OSF can be read by software to determine that an oscillator failure has occurred. The OSF can be set or cleared by software.

LOW ACTIVE RESET

One of the most notable features on this part is the low active reset. At this time this is the only 80C51 derivative available that has low active reset. This feature makes it easier to interface the 8XC575 into an application to accommodate the power-on and low voltage conditions that can occur. The low active reset operates exactly the same as high active reset with the exception that the part is put into the reset mode by applying a low level to the reset pin. For power-on reset it is also necessary to invert the power-on reset circuit; connecting the 8.2K resistor from the reset pin to V the reset pin to ground. Figure 1 shows all of the reset related circuitry.

When reset the port pins on the 87C575 are driven low asynchronously . This is different from all other 80C51 derivatives.

The 8XC575 also has Low voltage detection circuitry that will, if enabled, force the part to reset when V level. Low Voltage Reset is enabled by a normal reset. Low Voltage Reset can be disabled by clearing LVRE (bit 4 in the WDCON SFR) then executing a watchdog feed sequence (A5H to WFEED1 followed immediately by 5A to WFEED2). In addition there is a flag (LVF) that is set if a low voltage condition is detected. The LVF flag is set even if the Low Voltage detection circuitry is disabled. Notice that the Low voltage detection circuitry does not drive the RST# pin so the LVF flag is the only way that the microcontroller can determine if it has been reset due to a low voltage condition.

and the 10µf capacitor from

(on the part) fails below a set

80C575/83C575/

87C575

The 8XC575 has an on-chip power-on detection circuit that sets the POF (PCON.4) flag on power up or if the V momentarily drops to 0V. This flag can be used to determine if the part is being started from a power-on (cold start) or if a reset has occurred due to another condition (warm start).

TIMERS

The 87C575 has four on-chip timers. Timers 0 and 1 are identical in every way to

Timers 0 and 1 on the 80C51. Timer 2 on the 8XC575 is identical to the

80C52 Timer 2 (described in detail in the 80C52 overview) with the exception that it is an up or down counter. To configure the Timer to count down the DCEN bit in the T2MOD special function register must be set and a low level must be present on the T2EX pin (P1.1).

The Watchdog timer operation and implementation is the same as that for the 8XC550 (described in the 8XC550 overview) with the exception that the reset values of the WDCON and WDL special function registers have been changed. The changes in these registers cause the watchdog timer to be enabled with a timeout of 98304 × T when the part is reset. The watchdog can be disabled by executing a valid feed sequence and then clearing WDRUN (bit 2 in the WDCON SFR).

level

OSC

(LOW V

REFERENCE)

1998 May 01

VLOW

POWER-ON DETECT

–

RST

WATCHDOG FEED

SMOD1 SMOD0 OSF LVF GF0 GF1 IDL

OSC FREQ BELOW OSCF

(MIN FREQUENCY)

SHADOW REGISTER

FOR WDCON

PRE2 PRE1 PRE0 LVRE OFRE WDRUN WDTOF WDMOD

POF

PCON

(87GH)

8xC575 INTERNAL RESET

PCA WATCHDOG WATCHDOG TIMER

WDCON

(C0H)

SU00239

Figure 1. Reset Circuitry

Page 10

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

PROGRAMMABLE COUNTER ARRAY (PCA)

The Programmable Counter Array is a special Timer that has five 16-bit capture/compare modules associated with it. Each of the modules can be programmed to operate in one of four modes: rising and/or falling edge capture, software timer, high-speed output, or pulse width modulator. Each module has a pin associated with it in port 1. Module 0 is connected to P1.3(CEX0), module 1 to P1.4(CEX1), etc.. The basic PCA configuration is shown in Figure 2.

The PCA timer is a common time base for all five modules and can be programmed to run at: 1/12 the oscillator frequency, 1/4 the oscillator frequency, the Timer 0 overflow , or the input on the ECI pin (P1.2). The timer count source is determined from the CPS1 and CPS0 bits in the CMOD SFR as follows (see Figure 3):

CPS1 CPS0 PCA Timer Count Source

0 0 1/12 oscillator frequency 0 1 1/4 oscillator frequency 1 0 Timer 0 overflow 1 1 External Input at ECI pin

In the CMOD SFR are three additional bits associated with the PCA. They are CIDL which allows the PCA to stop during idle mode, WDTE which enables or disables the watchdog function on module 4, and ECF which when set causes an interrupt and the PCA overflow flag CF (in the CCON SFR) to be set when the PCA timer overflows. These functions are shown in Figure 3.

The watchdog timer function is implemented in module 4 as implemented in other parts that have a PCA that are available on the market. However, if a watchdog timer is required in the target application, it is recommended to use the hardware watchdog timer that is implemented on the 87C575 separately from the PCA (see Figure 14).

The CCON SFR contains the run control bit for the PCA and the flags for the PCA timer (CF) and each module (refer to Figure 6). To run the PCA the CR bit (CCON.6) must be set by software. The PCA is shut off by clearing this bit. The CF bit (CCON.7) is set when the PCA counter overflows and an interrupt will be generated if the ECF bit in the CMOD register is set, The CF bit can only be cleared by software. Bits 0 through 4 of the CCON register are the flags for the modules (bit 0 for module 0, bit 1 for module 1, etc.) and are set by hardware when either a match or a capture occurs. These flags also can only be cleared by software. The PCA interrupt system shown in Figure 4.

Each module in the PCA has a special function register associated with it. These registers are: CCAPM0 for module 0, CCAPM1 for module 1, etc. (see Figure 7). The registers contain the bits that control the mode that each module will operate in. The ECCF bit (CCAPMn.0 where n=0, 1, 2, 3, or 4 depending on the module) enables the CCF flag in the CCON SFR to generate an interrupt when a match or compare occurs in the associated module. PWM (CCAPMn.1) enables the pulse width modulation mode. The TOG bit (CCAPMn.2) when set causes the CEX output associated with the module to toggle when there is a match between the PCA counter and the module’s capture/compare register . The match bit MAT (CCAPMn.3) when set will cause the CCFn bit in the CCON register to be set when there is a match between the PCA counter and the module’s capture/compare register .

The next two bits CAPN (CCAPMn.4) and CAPP (CCAPMn.5) determine the edge that a capture input will be active on. The CAPN bit enables the negative edge, and the CAPP bit enables the positive edge. If both bits are set both edges will be enabled and a capture will occur for either transition. The last bit in

80C575/83C575/

87C575

the register ECOM (CCAPMn.6) when set enables the comparator function. Figure 8 shows the CCAPMn settings for the various PCA functions.

There are two additional registers associated with each of the PCA modules. They are CCAPnH and CCAPnL and these are the registers that store the 16-bit count when a capture occurs or a compare should occur. When a module is used in the PWM mode these registers are used to control the duty cycle of the output.

PCA Capture Mode

To use one of the PCA modules in the capture mode either one or both of the CCAPM bits CAPN and CAPP for that module must be set. The external CEX input for the module (on port 1) is sampled for a transition. When a valid transition occurs the PCA hardware loads the value of the PCA counter registers (CH and CL) into the module’s capture registers (CCAPnL and CCAPnH). If the CCFn bit for the module in the CCON SFR and the ECCFn bit in the CCAPMn SFR are set then an interrupt will be generated. Refer to Figure 9.

16-bit Software Timer Mode

The PCA modules can be used as software timers by setting both the ECOM and MAT bits in the modules CCAPMn register. The PCA timer will be compared to the module’s capture registers and when a match occurs an interrupt will occur if the CCFn (CCON SFR) and the ECCFn (CCAPMn SFR) bits for the module are both set (see Figure 10).

High Speed Output Mode

In this mode the CEX output (on port 1) associated with the PCA module will toggle each time a match occurs between the PCA counter and the module’s capture registers. To activate this mode the TOG, MAT, and ECOM bits in the module’s CCAPMn SFR must be set (see Figure 11).

MODULE FUNCTIONS:

16-BIT CAPTURE 16-BIT TIMER 16-BIT HIGH SPEED OUTPUT 8-BIT PWM WATCHDOG TIMER (MODULE 4 ONLY)

1998 May 01

16 BITS

PCA TIMER/COUNTER

TIME BASE FOR PCA MODULES

16 BITS

MODULE 0

MODULE 1

MODULE 2

MODULE 3

MODULE 4

Figure 2. Programmable Counter Array (PCA)

P1.3/CEX0

P1.4/CEX1

P1.5/CEX2

P1.6/CEX3

P1.7/CEX4

SU00032

Page 11

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

OSC/12

OSC/4

TIMER 0

OVERFLOW

EXTERNAL INPUT

(P1.2/ECI)

IDLE

00 01

DECODE

10 11

CIDL WDTE –– –– –– CPS1 CPS0 ECF

CF CR CCF4 CCF3 CCF2 CCF1 CCF0––

CH CL

16–BIT UP COUNTER

80C575/83C575/

87C575

TO PCA

MODULES

OVERFLOW

CMOD

(D9H)

CCON (D8H)

INTERRUPT

PCA TIMER/COUNTER

MODULE 0

MODULE 1

MODULE 2

MODULE 3

MODULE 4

CMOD.0 ECF

Figure 3. PCA Timer/Counter

CF CR CCF4 CCF3 CCF2 CCF1 CCF0––

CCAPMn.0 ECCFn

Figure 4. PCA Interrupt System

IE.6

IE.7

SU00033

CCON

(D8H)

TO INTERRUPT PRIORITY DECODER

SU00034

1998 May 01

Page 12

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

CMOD Address = OD9H

80C575/83C575/

87C575

Reset Value = 00XX X000B

CIDL WDTE – – – CPS1 CPS0 ECF

Bit:

76543210

Symbol Function

CIDL Counter Idle control: CIDL = 0 programs the PCA Counter to continue functioning during idle Mode. CIDL = 1 programs

it to be gated off during idle. WDTE Watchdog Timer Enable: WDTE = 0 disables Watchdog Timer function on PCA Module 4. WDTE = 1 enables it. – Not implemented, reserved for future use.*

CPS1 PCA Count Pulse Select bit 1. CPS0 PCA Count Pulse Select bit 0.

CPS1 CPS0 Selected PCA Input**

0 0 0 Internal clock, f 0 1 1 Internal clock, f

OSC OSC

÷ 12

÷ 4 1 0 2 Timer 0 overflow 1 1 3 External clock at ECI/P1.2 pin (max. rate = f

OSC

÷ 8)

ECF PCA Enable Counter Overflow interrupt: ECF = 1 enables CF bit in CCON to generate an interrupt. ECF = 0 disables

that function of CF.

NOTE:

* User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the

new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.

** f

= oscillator frequency

OSC

SU00035

Figure 5. CMOD: PCA Counter Mode Register

CCON Address = OD8H

Reset Value = 00X0 0000B

Bit Addressable

CF CR – CCF4 CCF3 CCF2 CCF1 CCF0

Bit:

76543210

Symbol Function CF PCA Counter Overflow flag. Set by hardware when the counter rolls over. CF flags an interrupt if bit ECF in CMOD is

set. CF may be set by either hardware or software but can only be cleared by software.

CR PCA Counter Run control bit. Set by software to turn the PCA counter on. Must be cleared by software to turn the PCA

counter off.

– Not implemented, reserved for future use*.

CCF4 PCA Module 4 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. CCF3 PCA Module 3 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. CCF2 PCA Module 2 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. CCF1 PCA Module 1 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. CCF0 PCA Module 0 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software.

NOTE:

* User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the

new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.

SU00036

Figure 6. CCON: PCA Counter Control Register

1998 May 01

Page 13

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

CCAPMn Address CCAPM0 0DAH

Not Bit Addressable

Bit:

Symbol Function – Not implemented, reserved for future use*.

ECOMn Enable Comparator. ECOMn = 1 enables the comparator function. CAPPn Capture Positive, CAPPn = 1 enables positive edge capture. CAPNn Capture Negative, CAPNn = 1 enables negative edge capture. MATn Match. When MATn = 1, a match of the PCA counter with this module’s compare/capture register causes the CCFn bit

TOGn Toggle. When T OGn = 1, a match of the PCA counter with this module’s compare/capture register causes the CEXn

PWMn Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a pulse width modulated output. ECCFn Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register to generate an interrupt.

NOTE:

*User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.

in CCON to be set, flagging an interrupt.

pin to toggle.

CCAPM1 0DBH CCAPM2 0DCH CCAPM3 0DDH CCAPM4 0DEH

– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn

76543210

Figure 7. CCAPMn: PCA Modules Compare/Capture Registers

80C575/83C575/

87C575

Reset Value = X000 0000B

SU00037

ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn MODULE FUNCTION

–

X 0 0 0 0 0 0 0 No operation X X 1 0 0 0 0 X 16-bit capture by a positive-edge trigger on CEXn X X 0 1 0 0 0 X 16-bit capture by a negative trigger on CEXn X X 1 1 0 0 0 X 16-bit capture by a transition on CEXn X 1 0 0 1 0 0 X 16-bit Software Timer X 1 0 0 1 1 0 X 16-bit High Speed Output X 1 0 0 0 0 1 0 8-bit PWM X 1 0 0 1 X 0 X Watchdog Timer

Figure 8. PCA Module Modes (CCAPMn Register)

1998 May 01

Page 14

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

CF CR CCF4 CCF3 CCF2 CCF1 CCF0––

(TO CCFn)

CEXn

–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn

0 000

Figure 9. PCA Capture Mode

CAPTURE

80C575/83C575/

CCON

(D8H)

PCA TIMER/COUNTER

CH CL

CCAPnH CCAPnL

CCAPMn, n= 0 to 4

(DAH – DEH)

87C575

PCA INTERRUPT

SU00749

WRITE TO

CCAPnL

WRITE TO

CCAPnH

RESET

ENABLE

CF CR CCF4 CCF3 CCF2 CCF1 CCF0––

CCAPnH

16–BIT COMPARATOR

CH CL

PCA TIMER/COUNTER

–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn

CCAPnL

(TO CCFn)

MATCH

0000

Figure 10. PCA Compare Mode

CCON (D8H)

PCA INTERRUPT

CCAPMn, n= 0 to 4

(DAH – DEH)

SU00750

1998 May 01

Page 15

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

CF CR CCF4 CCF3 CCF2 CCF1 CCF0––

WRITE TO

CCAPnL

WRITE TO

CCAPnH

RESET

ENABLE

CCAPnH CCAPnL

16–BIT COMPARATOR

CH CL

PCA TIMER/COUNTER

–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn

MATCH

(TO CCFn)

Figure 11. PCA High Speed Output Mode

80C575/83C575/

87C575

CCON (D8H)

PCA INTERRUPT

TOGGLE

CEXn

CCAPMn, n: 0..4

(DAH – DEH)

1000

SU00751

Pulse Width Modulator Mode

All of the PCA modules can be used as PWM outputs. Figure 12 shows the PWM function. The frequency of the output depends on the source for the PCA timer. All of the modules will have the same frequency of output because they all share the PCA timer. The duty cycle of each module is independently variable using the module’s capture register CCAPLn. When the value of the PCA CL SFR is less than the value in the module’s CCAPLn SFR the output will be low, when it is equal to or greater than the output will be high. When CL overflows from FF to 00, CCAPLn is reloaded with the value in CCAPHn. the allows updating the PWM without glitches. The PWM and ECOM bits in the module’s CCAPMn register must be set to enable the PWM mode.

WATCHDOG TIMER

The watchdog timer is not directly loadable by the user. Instead, the value to be loaded into the main timer is held in an autoload register or is part of the mask ROM programming. In order to cause the main timer to be loaded with the appropriate value, a special sequence of software action must take place. This operation is referred to as feeding the watchdog timer.

To feed the watchdog, two instructions must be sequentially executed successfully. No

intervening instruction fetches are allowed, so interrupts should be disabled before feeding the watchdog. The instructions should move A5H to the WFEED1 register and then 5AH to the WFEED2 register. If WFEED1 is correctly loaded and WFEED2 is not correctly loaded, then an immediate underflow will occur.

The watchdog timer subsystem has two modes of operation. Its principal function is a watchdog timer. In this mode it protects the system from incorrect code execution by causing a system reset when the watchdog timer underflows as a result of a failure of software to feed the timer prior to the timer reaching its terminal count. If the user does not employ the watchdog function, the watchdog subsystem can be used as a timer. In this mode, reaching the terminal count sets a flag. In most other respects, the timer mode possesses the characteristics of the watchdog mode. This is done to protect the integrity of the watchdog function.

The watchdog timer subsystem consists of a prescaler and a main counter. The prescaler has 8 selectable taps off the final stages and the output of a selected tap provides the clock to the main counter. The main counter is the section that is loaded as a result of the software feeding the watchdog and it is the section that causes the system reset

(watchdog mode) or time-out flag to be set (timer mode) if allowed to reach its terminal count.

Programming the Watchdog Timer

Both the EPROM and ROM devices have a set of SFRs for holding the watchdog autoload values and the control bits. The watchdog time-out flag is present in the watchdog control register and operates the same in all versions. In the EPROM device, the watchdog parameters (autoload value and control) are always taken from the SFRs. In the ROM device, the watchdog parameters can be mask programmed or taken from the SFRs. The selection to take the watchdog parameters from the SFRs or from the mask programmed values is controlled by EA (external access). When EA is high (internal ROM access), the watchdog parameters are taken from the mask programmed values. If the watchdog is mask programmed to the timer mode, then the autoload values and the pre-scaler taps are taken from the SFRs. When EA is low (external access), the watchdog parameters are taken from the SFRs. The user should be able to leave code in his program which initializes the watchdog SFRs even though he has migrated to the mask ROM part. This allows no code changes from EPROM prototyping to ROM coded production parts.

1998 May 01

Page 16

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

CCAPnH

CCAPnL

ENABLE

OVERFLOW

–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn

Figure 12. PCA PWM Mode

8–BIT

COMPARATOR

PCA TIMER/COUNTER

CL < CCAPnL

CL >= CCAPnL

0000

80C575/83C575/

CEXn

CCAPMn, n: 0..4

(DAH – DEH)

SU00752

87C575

Watchdog Detailed Operation

EPROM Device (and ROMless Operation: EA

= 0)

In the ROMless operation (ROM part, EA and in the EPROM device, the watchdog operates in the following manner (see Figure 14).

Whether the watchdog is in the watchdog or timer mode, when external RESET is applied, the following takes place:

= 0)

•Watchdog mode bit set to watchdog mode.

•Watchdog run control bit set to ON.

•Autoload register set to 00 (min. count).

•Watchdog time-out flag cleared.

•Prescaler is cleared.

•Prescaler tap set to the highest divide.

•Autoload takes place.

The watchdog can be fed even though it is in the timer mode.

Note that the operational concept is for the watchdog mode of operation, when coming out of a hardware reset, the software should load the autoload registers, set the mode to watchdog, and then feed the watchdog (cause an autoload). The watchdog will now be starting at a known point.

If the watchdog is in the watchdog mode and running and happens to underflow at the time the external RESET is applied, the watchdog time-out flag will be cleared.

When the watchdog is in the watchdog mode and the watchdog underflows, the following action takes place (see Figure 16):

•Autoload takes place.

•Watchdog time-out flag is set

•Mode bit unchanged.

•Watchdog run bit unchanged.

•Autoload register unchanged.

•Prescaler tap unchanged.

•All other device action same as external

reset.

Note that if the watchdog underflows, the program counter will start from 00H as in the case of an external reset. The watchdog time-out flag can be examined to determine if the watchdog has caused the reset condition. The watchdog time-out flag bit can be cleared by software.

When the watchdog is in the timer mode and the timer software underflows, the following action takes place:

•Autoload takes place.

•Watchdog time-out flag is set

•Mode bit unchanged.

•Watchdog run bit unchanged.

•Autoload register unchanged.

•Prescaler tap unchanged.

Mask ROM Device (EA = 1)

In the mask ROM device, the watchdog mode bit (WDMOD) is mask programmed and the bit in the watchdog command register is read only and reflects the mask programmed selection. If the mask programmed mode bit selects the timer mode, then the watchdog run bit (WDRUN) operates as described under EPROM Device. If the mask programmed bit selects the watchdog mode, then the watchdog run bit has no effect on the timer operation (see Figure 15).

Watchdog Function

The watchdog consists of a programmable prescaler and the main timer. The prescaler derives its clock from the on-chip oscillator. The prescaler consists of a divide by 12 followed by a 13 stage counter with taps from stage 6 through stage 13. This is shown in Figure 17. The tap selection is programmable. The watchdog main counter is a down counter clocked (decremented) each time the programmable prescaler underflows. The watchdog generates an underflow signal (and is autoloaded) when the watchdog is at count 0 and the clock to decrement the watchdog occurs. The watchdog is 8 bits long and the autoload value can range from 0 to FFH. (The autoload value of 0 is permissible since the prescaler is cleared upon autoload).

This leads to the following user design equations. Definitions :t

is the oscillator

OSC

1998 May 01

Page 17

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

period, N is the selected prescaler tap value, W is the main counter autoload value, t

MIN

the minimum watchdog time-out value (when the autoload value is 0), t

is the maximum

MAX

time-out value (when the autoload value is FFH), t

is the design time-out value.

= t

MIN

OSC

MIN

× 12 × 64 × 128 × 256

PRESCALER

× 2

× (W + 1)

MIN

MAX

tD = t (where prescaler = 0, 1, 2, 3, 4, 5, 6, or 7)

Note that the design procedure is anticipated to be as follows. A t

will be chosen either

MAX

from equipment or operation considerations and will most likely be the next convenient value higher than t

. (If the watchdog were

inadvertently to start from FFH, an overflow would be guaranteed, barring other anomalies, to occur within t

). Then the

MAX

value for the prescaler would be chosen from:

prescaler = log2 (t This then also fixes t

/ (t

MAX

MIN

× 12 × 256)) - 6

OSC

. An autoload value

would then be chosen from:

/ t

W = t

- 1

MIN

The software must be written so that a feed operation takes place every t

seconds from

the last feed operation. Some tradeoffs may need to be made. It is not advisable to include feed operations in minor loops or in subroutines unless the feed operation is a specific subroutine.

Watchdog Control Register (WDCON) (Bit Addressable) Address C0

The following bits of this register are read only in the ROM part when EA

is high: WDMOD, PRE0, PRE1, and PRE2. That is, the register will reflect the mask programmed values. In the ROM part with EA

high, these bits are taken from mask coded bits and are not readable by the program. WDRUN is read only in the ROM part when EA

is high

and WDMOD is in the watchdog mode. When

WDMOD is in the timer mode, WDRUN functions normally.

The parameters written into WDMOD, PRE0, PRE1, and PRE2 by the program are not applied directly to the watchdog timer subsystem. The watchdog timer subsystem is directly controlled by a second register which stores these bits. The transfer of these bits from the user register (WDMOD) to the second control register takes place when the watchdog is fed. This prevents random code execution from directly foiling the watchdog function. This does not affect the operation where these bits are taken from mask coded values.

The reset values of the WDCON and WDL registers will be such that the timer resets to the watchdog mode with a timeout period of 12 × 64 × 128 × t

. The watchdog timer

OSC

will not generate an interrupt. Additional bits in WDCON are used to disable reset generation by the oscillator fail and low voltage detect circuits. WDCON can be written by software only by executing a valid watchdog feed sequence.

WDCON Register Bit Definitions

WDCON.7 PRE2 Prescaler Select 2,

reset to 1

WDCON.6 PRE1 Prescaler Select 1,

reset to 1

WDCON.5 PRE0 Prescaler Select 0,

reset to 1

WDCON.4 LVRE Low Voltage Reset

Enable, reset to 1 (enabled)

WDCON.3 OFRE Oscillator Fail Reset

Enable, reset to 1 (enabled)

WDCON.2 WDRUN Watchdog Run,

reset to 1 (enabled)

WDCON.1 WDTOF Watchdog Timeout

Flag, reset = Indeterminate

WDCON.0 WDMOD Watchdog Mode,

reset to 1 (watchdog mode)

80C575/83C575/

87C575

Enhanced UART

The UART operates in all of the usual modes that are described in the first section of this book for the 80C51. In addition the UART can perform framing error detect by looking for missing stop bits, and automatic address recognition. The 87C575 UART also fully supports multiprocessor communication as does the standard 80C51 UART.

When used for framing error detect the UART looks for missing stop bits in the communication. A missing bit will set the FE bit in the SCON register. The FE bit shares the SCON.7 bit with SM0 and the function of SCON.7 is determined by PCON.6 (SMOD0) (see Figure 19). If SMOD0 is set then SCON.7 functions as FE. SCON.7 functions as SM0 when SMOD0 is cleared. When used as FE SCON.7 can only be cleared by software. Refer to Figure 18.

Automatic Address Recognition

Automatic Address Recognition is a feature which allows the UART to recognize certain addresses in the serial bit stream by using hardware to make the comparisons. This feature saves a great deal of software overhead by eliminating the need for the software to examine every serial address which passes by the serial port. This feature is enabled by setting the SM2 bit in SCON. In the 9 bit UART modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be automatically set when the received byte contains either the “Given” address or the “Broadcast” address. The 9 bit mode requires that the 9th information bit is a 1 to indicate that the received information is an address and not data. Automatic address recognition is shown in Figure 20.

The 8 bit mode is called Mode 1. In this mode the RI flag will be set if SM2 is enabled and the information received has a valid stop bit following the 8 address bits and the information is either a Given or Broadcast address.

Mode 0 is the Shift Register mode and SM2 is ignored.

1998 May 01

Page 18

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

CIDL WDTE –– –– –– CPS1 CPS0 ECF

WRITE TO CCAP4L

WRITE TO CCAP4H

RESET

ENABLE

CCAP4H CCAP4L

16–BIT COMPARATOR

CH CL

PCA TIMER/COUNTER

–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn

MATCH

Figure 13. PCA Watchdog Timer

80C575/83C575/

87C575

CMOD (D9H)

RESET

CCAPM4 (DEH)

X000

SU00042

WATCHDOG FEED SEQUENCE

MOV WFEED1,#0A5H MOV WFEED2,#5AH

WDL (C1H)

PRESCALEROSC/12

PRE2 PRE1 PRE0 LVRE OFRE WDRUN WDTOF WDMOD

8–BIT DOWN

COUNTER

Figure 14. Watchdog Timer in 87C575 and 80C575 / 83C575 (EA = 0)

RESET

SHADOW REGISTER

FOR WDCON

WDCON

(C0H)

SU00240

1998 May 01

Page 19

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

WATCHDOG FEED SEQUENCE

MOV WFEED1,#0A5H MOV WFEED2,#5AH

PRESCALEROSC/12

SHADOW REGISTER

FOR WDCON

PRE2 PRE1 PRE0 LVRE OFRE WDRUN WDTOF WDMOD

Figure 15. Watchdog Timer of 83C575 in Watchdog Mode (EA = 1, WDMOD = 1)

8–BIT DOWN

COUNTER

80C575/83C575/

87C575

ROM–CODE

ADDRESS

2032H 2031H 2030H

SU00241

CONTENT WD PRE2:0 WDMOD

WDCON

(C0H)

WATCHDOG FEED SEQUENCE

MOV WFEED1,#0A5H MOV WFEED2,#5AH

PRESCALEROSC/12

SHADOW REGISTER

FOR WDCON

PRE2 PRE1 PRE0 LVRE OFRE WDRUN WDTOF WDMOD

8–BIT DOWN

COUNTER

Figure 16. Watchdog Timer of 83C575 in Timer Mode (EA = 1, WDMOD = 0)

ROM–CODE

CONTENT WD PRE2:0 WDMOD

WDCON

(C0H)

ADDRESS

2032H 2031H 2030H

SU00242

1998 May 01

Page 20

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

OSC/12 ÷64

PRE2 PRE1

PRE0

DECODE

SCON Address = 98H

Bit Addressable

SM0/FE SM1 SM2 REN TB8 RB8 Tl Rl

Bit: 76543210

(SMOD0 = 0/1)*

÷64 ÷128 ÷256 ÷512 ÷1024 ÷2048 ÷4096 ÷8192

000 001 010 011 100 101 110 111

÷2 ÷2 ÷2 ÷2 ÷2 ÷2 ÷2

Figure 17. Watchdog Prescaler

80C575/83C575/

87C575

TO WATCHDOG

DOWN COUNTER

SU00243

Reset Value = 0000 0000B

Symbol Function FE Framing Error bit. This bit is set by the receiver when an invalid stop bit is detected. The FE bit is not cleared by valid

frames but should be cleared by software. The SMOD0 bit must be set to enable access to the FE bit.

SM0 Serial Port Mode Bit 0, (SMOD0 must = 0 to access bit SM0) SM1 Serial Port Mode Bit 1

SM0 SM1 Mode Description Baud Rate**

0 0 0 shift register f

OSC

/12 0 1 1 8-bit UART variable 1 0 2 9-bit UART f

OSC

/64 or f

OSC

/32

1 1 3 9-bit UART variable

SM2 Enables the Automatic Address Recognition feature in Modes 2 or 3. If SM2 = 1 then Rl will not be set unless the

received 9th data bit (RB8) is 1, indicating an address, and the received byte is a Given or Broadcast Address. In Mode 1, if SM2 = 1 then Rl will not be activated unless a valid stop bit was received, and the received byte is a Given or Broadcast Address. In Mode 0, SM2 should be 0.

REN Enables serial reception. Set by software to enable reception. Clear by software to disable reception. TB8 The 9th data bit that will be transmitted in Modes 2 and 3. Set or clear by software as desired. RB8 In modes 2 and 3, the 9th data bit that was received. In Mode 1, if SM2 = 0, RB8 is the stop bit that was received.

In Mode 0, RB8 is not used.

Tl Transmit interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or at the beginning of the stop bit in the

other modes, in any serial transmission. Must be cleared by software.

Rl Receive interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or halfway through the stop bit time in

the other modes, in any serial reception (except see SM2). Must be cleared by software.

NOTE:

*SMOD0 is located at PCON6.

= oscillator frequency

**f

OSC

Figure 18. SCON: Serial Port Control Register

SU00043

1998 May 01

Page 21

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

D0 D1 D2 D3 D4 D5 D6 D7 D8

START

BIT

SM0 / FE SM1 SM2 REN TB8 RB8 TI RI

SMOD1 SMOD0 – POF LVF GF0 GF1 IDL

0 : SCON.7 = SM0 1 : SCON.7 = FE

Figure 19. UART Framing Error Detection

DATA BYTE

SET FE BIT IF STOP BIT IS 0 (FRAMING ERROR)

SM0 TO UART MODE CONTROL

80C575/83C575/

87C575

ONLY IN

MODE 2, 3

SCON

(98H)

PCON

(87H)

STOP

BIT

SU00044

Using the Automatic Address Recognition feature allows a master to selectively communicate with one or more slaves by invoking the Given slave address or addresses. All of the slaves may be contacted by using the Broadcast address. Two special Function Registers are used to define the slave’s address, SADDR, and the address mask, SADEN. SADEN is used to define which bits in the SADDR are to b used and which bits are “don’t care”. The SADEN mask can be logically ANDed with the SADDR to create the “Given” address which the master will use for addressing each of the slaves. Use of the Given address allows multiple slaves to be recognized while excluding others. The following examples will help to show the versatility of this scheme:

Slave 0 SADDR = 1100 0000

SADEN = 1111 1101 Given = 1100 00X0

Slave 1 SADDR = 1100 0000

SADEN = 1111 1110 Given = 1100 000X

In the above example SADDR is the same and the SADEN data is used to differentiate between the two slaves. Slave 0 requires a 0 in bit 0 and it ignores bit 1. Slave 1 requires a 0 in bit 1 and bit 0 is ignored. A unique address for Slave 0 would be 1100 0010 since slave 1 requires a 0 in bit 1. A unique address for slave 1 would be 1100 0001 since a 1 in bit 0 will exclude slave 0. Both

slaves can be selected at the same time by an address which has bit 0 = 0 (for slave 0) and bit 1 = 0 (for slave 1). Thus, both could be addressed with 1100 0000.

In a more complex system the following could be used to select slaves 1 and 2 while excluding slave 0:

Slave 0 SADDR = 1100 0000

SADEN = 1111 1001 Given = 1100 0XX0

Slave 1 SADDR = 1110 0000

SADEN = 1111 1010 Given = 11 10 0X0X

Slave 2 SADDR = 1110 0000

SADEN = 1111 1100 Given = 1110 00XX

In the above example the differentiation among the 3 slaves is in the lower 3 address bits. Slave 0 requires that bit 0 = 0 and it can be uniquely addressed by 1110 0110. Slave 1 requires that bit 1 = 0 and it can be uniquely addressed by 1110 and 0101. Slave 2 requires that bit 2 = 0 and its unique address is 1110 0011. To select Slaves 0 and 1 and exclude Slave 2 use address 1110 0100, since it is necessary t make bit 2 = 1 to exclude slave 2.

The Broadcast Address for each slave is created by taking the logical OR of SADDR and SADEN. Zeros in this result are treated

as don’t-cares. In most cases, interpreting the don’t-cares as ones, the broadcast address will be FF hexadecimal.

Upon reset SADDR (SFR address 0A9H) and SADEN (SFR address 0B9H) are loaded with 0s. This produces a given address of all “don’t cares” as well as a Broadcast address of all “don’t cares”. this effectively disables the Automatic Addressing mode and allows the microcontroller to use standard 80C51 type UART drivers which do not make use of this feature.

Analog Comparators

Four analog comparators are provided on chip. Three comparators have a common negative reference CMPR- and independent positive inputs CMP1+, CMP2+, CMP3+ on port 3. The fourth comparator has independent positive and negative inputs CMP0+ and CMP0- on port 1. The CMP register contains an output and enable bit for each comparator. The CMP register is bit addressable and is located at SFR address E8H. Figure 21 shows the connection of the comparators.

Pullups at the comparator input pins will be disabled by hardware when the comparator is enabled. In addition, to make inputs high impedance, the corresponding port SFR bits must be set by software to disable the pulldowns.

1998 May 01

Page 22

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

D0 D1 D2 D3 D4 D5 D6 D7 D8

SM0 SM1 SM2 REN TB8 RB8 TI RI

11 X

COMPARATOR

RECEIVED ADDRESS D0 TO D7

PROGRAMMED ADDRESS

IN UART MODE 2 OR MODE 3 AND SM2 = 1: INTERRUPT IF REN=1, RB8=1 AND “RECEIVED ADDRESS” = “PROGRAMMED ADDRESS” – WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES – WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS.

Figure 20. UART Multiprocessor Communication, Automatic Address Recognition

CMP Register Bit Definitions

CMP.7 enable comparator 3,

disable pullups at P3.4, P3.7

CMP.6 enable comparator 2,

disable pullups at P3.4, P3.6

CMP.5 enable comparator 1,

disable pullups at P3.4, P3.5

CMP.4 enable comparator 0,

disable pullups at P1.0, P1.1 CMP.3 comparator 3 output (read only) CMP.2 comparator 2 output (read only) CMP.1 comparator 1 output (read only) CMP.0 comparator 0 output (read only)

All comparators are disabled automatically in power down mode, in idle mode unused comparators should be disabled by software to save power. A comparator can generate an interrupt that will terminate idle mode.

The CMPE register contains bits to enable each comparator to drive external output pins or internal PCA capture inputs. Pullups at the output pins are disabled by hardware when the external comparator output is enabled. The comparator output is wire-ORed with the corresponding port SFR bit, so the SFR bit must also be set by software to enable the output.

1 1

1 0

CMPE Register Bit Definitions

CMPE.7 enables comparator 3 to drive

CEX3

CMPE.6 enables comparator 2 to drive

CEX2

CMPE.5 enables comparator 1 to drive

CEX1

CMPE.4 enables comparator 0 to drive

CEX0

CMPE.3 enables comparator 3 output on

P1.6 (open drain)

CMPE.2 enables comparator 2 output on

P1.5 (open drain)

CMPE.1 enables comparator 1 output on

P1.4 (open drain)

CMPE.0 enables comparator 0 output on

P1.3 (open drain)

When 1s are written to CMPE bits 7-4, the comparator outputs will drive the corresponding capture input. (This function is not available in the idle or power-down mode.) When 1s are written to CMPE bits 3-0 the comparator output will also drive the corresponding port 1 pin. (This function is available in idle mode.) If the comparator’s enabled to drive the capture input but not the port pin, then the port pin can be used for general purpose I/O. When a comparator output is enabled, pullups at the output pin are disabled and the output becomes open drain. The comparator output can be used to trigger a capture input in idle mode by programming the CMPE register to drive the

80C575/83C575/

87C575

SCON

(98H)

SU00045

pin from the comparator output to have the pin supply the capture trigger.

There are two special function registers associated with the comparators. They are CMP which contains the comparator enables and a bit that can be read by software to determine the state of each comparator’s output, and CMPE which controls whether the output from each comparator drives the associated output pin or a capture input associated with one of the PCA modules.

The CMP registers bits 0–3 can be read by software to determine the state of the output of each comparator. To do this the associated comparator must be enabled but the output in port 1 can be disabled. This allows easy polling of the comparator output value without the need to use up a port pin.

The CMPE register allows the comparator to drive the associated PCA module capture input, so that on compare a capture can be generated in the PCA. Bits 0–3 of this register enable the comparator output to drive the associated port 1 output circuitry. Used as a comparator output this circuitry is open drain. To enable the comparator output to drive to port 1, the corresponding port bit must also be set to disable the pulldown. If the comparator is not enabled to drive the port 1 circuitry, the associated port 1 pin can be used for other I/O. This includes when a comparator is enabled to drive the capture input to a PCA module.

1998 May 01

Page 23

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

EC3TDC EC2TDC EC1TDC EC0TDC EC3OD * EC2OD * EC1OD * EC0OD *

P1.0 / CMP0+ P1.1 / CMP0–

P3.5 / CMP1+

P3.6 / CMP2+

P3.7 / CMP3+ P3.4 / CMPR–

–

ENABLE

–

ENABLE

–

ENABLE

–

ENABLE

TO CEX0 INPUT OF

PCA MODULE 0

TO CEX1 INPUT OF

PCA MODULE 1

TO CEX2 INPUT OF

PCA MODULE 2

TO CEX3 INPUT OF

PCA MODULE 3

80C575/83C575/

87C575

CMPE

(91H)

P1.3 / CMP0

P1.4 / CMP1

P1.5 / CMP2

P1.6 / CMP3

* : WILL DISABLE PULLUPS ON RELEVANT PINS

EC3DP * EC2DP * EC1DP * EC0DP * C3R0 C2R0 C1R0 C0R0

Reduced EMI Mode

There are two bits in the AUXR register that can be set to reduce the internal clock drive and disable the ALE output. AO (AUXR.0) when set turns off the ALE output. LO (AUXR.1) when set reduces the drive of the internal clock circuitry. Both bits are cleared on Reset. With LO set the 87C575 will still operate at 12MHz, but will have reduced EMI in the range above 100MHz.

AUXR (8EH)

–– –– –– –– –– –– LO AO

AO: Turns off ALE output. LO: Reduces drive of internal clock

circuitry. 8XC575 spec’d to 12MHz when LO set.

Figure 21. Analog Comparators

INTERNAL RESET

Internal resets generated by the power on, low voltage, and oscillator fail detect circuits are self timed to guarantee proper initialization of the 8XC575. Reset will be held approximately 24 oscillator periods after normal conditions are detected by all enabled detect circuits. Internal resets do not drive RST

but will cause missing pulses on ALE.

Interrupt Enable (IE) Register

EA IE.7 enable all interrupts EC IE.6 enable PCA interrupt ET2 IE.5 enable Timer 2 interrupt ES IE.4 enable Serial I/O interrupt ET1 IE.3 enable Timer 1 interrupt EX1 IE.2 enable External interrupt 1 ET0 IE.1 enable Timer 0 interrupt EX0 IE.0 enable External interrupt 0

CMP

(E8H)

SU00244

Interrupt Priority (IP) Register

IP.7 reserved PPC IP .6 PCA interrupt priority PT2 IP.5 Timer 2 interrupt priority PS IP.4 Serial I/O interrupt priority PT1 IP.3 Timer 1 interrupt priority PX1 IP.2 External interrupt 1 priority PT0 IP.1 Timer 0 interrupt priority PX0 IP.0 External interrupt 0 priority

Priority Source Flag Vector

1 INT0 IE0 03H highest priority

Timer 0

TF0 0BH 3 INT1 IE1 13H 4

Timer 1

TF1 1BH

87C575

5 PCA 6

Serial I/O Timer 2 TF2/EXF2

CF,CCFn

33H

RI,TI 23H

2BH lowest priority

80C575/83C575/87C575

Serial I/O RI/TI Timer 2 TF2/EXF2

6 7

PCA CF, CCFn33H lowest priority

23H 23H

Power Control (PCON) Register

SMOD1 PCON.7 double baud rate bit SMOD0 PCON.6 SCON.7 access control OSF PCON.5 oscillator fail flag POF PCON.4 power off flag LVF PCON.3 low voltage flag GF0 PCON.2 general purpose flag PD PCON.1 power down mode bit IDL PCON.0 idle mode bit Port 2 Pullup Disable Register

1998 May 01

Page 24

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

OSCILLATOR CHARACTERISTICS

XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier. The pins can be configured for use as an on-chip oscillator, as shown in the Logic Symbol, page 4.

To drive the device from an external clock source, XTAL1 should be driven while XTAL2 is left unconnected. There are no requirements on the duty cycle of the external clock signal, because the input to the internal clock circuitry is through a divide-by-two flip-flop. However, minimum and maximum high and low times specified in the data sheet must be observed.

IDLE MODE

In idle mode, the CPU puts itself to sleep while all of the on-chip peripherals stay active. The instruction to invoke the idle mode is the last instruction executed in the normal operating mode before the idle mode is activated. The CPU contents, the on-chip RAM, and all of the special function registers remain intact during this mode. The idle mode can be terminated either by any enabled interrupt (at which time the process is picked up at the interrupt service routine and continued), or by a hardware reset which starts the processor in the same manner as a power-on reset.

80C575/83C575/

87C575

POWER-DOWN MODE

In the power-down mode, the oscillator is stopped and the instruction to invoke power-down is the last instruction executed. Only the contents of the on-chip RAM are preserved. The control bits for the reduced power modes are in the special function register PCON. Power-down mode can be terminated with either a hardware reset or external interrupt. With an external interrupt INT0

or INT1 must be enabled and configured as level sensitive. Holding the pin low restarts to oscillator and bringing the pin back high completes the exit.

If the watchdog is enabled (WDRUN = 1), then power-down mode is disabled.

DESIGN CONSIDERATIONS

At power-on, the voltage on VCC must come up with RST

Table 2 shows the state of I/O ports during low current operating modes.

low for a proper start-up.

Table 2. External Pin Status During Idle and Power-Down Modes

MODE PROGRAM MEMORY ALE PSEN PORT 0 PORT 1 PORT 2 PORT 3

Idle Internal 1 1 Data Data Data Data Idle External 1 1 Float Data Address Data Power-down Internal 0 0 Data Data Data Data Power-down External 0 0 Float Data Data Data

1998 May 01

Page 25

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

80C575/83C575/

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

ROM CODE SUBMISSION

When submitting ROM code for the 83C575, the following must be specified:

1. 8k byte user ROM data

2. 32 byte ROM encryption key

3. ROM security bits

4. The watchdog timer parameters.

ADDRESS

0000H to 1FFFH DATA 7:0 User ROM Data 2000H to 201FH KEY 7:0 ROM Encryption Key

2020H Reserved

2030H Reserved 7:0 Must = FFH 2031H Reserved 7:0 Must = FFH 2032H WDL

2033H WDCON 2033H WDCON 2033H WDCON 2033H WDCON 2033H WDCON 2033H WDCON

NOTES:

1. See Watchdog Timer Specification for definition of WDL and WDCON bits.

CONTENT BIT(S) COMMENT

FFH = no encryption

Security Bit 2 Security Bit 1

1 1 1 1 1 1

2 1 0

7:0 Watchdog reload value

7:5 PRE2:0 4 LVRE 3 OFRE 2 WDRUN=0, not ROM coded 1 WDTOF=0, not ROM coded 0 WDMOD

Must = 1

0 = enable, 1 = disable 0 = enable, 1 = disable

(see specification)

87C575

Security Bit 1: When programmed, this bit has two effects on masked ROM parts:

1. External MOVC is disabled, and

2. EA# is latched on Reset.

Security Bit 2: When programmed, this bit inhibits Verify User ROM.

ABSOLUTE MAXIMUM RATINGS

PARAMETER

Operating temperature under bias –55 to +125 °C Storage temperature range –65 to +150 °C Voltage on EA/VPP pin to V Voltage on any other pin to V Maximum IOL per I/O pin 15 mA Power dissipation (based on package heat transfer limitations, not

device power consumption)

NOTES:

1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section of this specification is not implied.

2. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima.

3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to V noted.

1, 2, 3

RATING UNIT

0 to +13.0 V

–0.5 to +6.5 V

1.5 W

unless otherwise

1998 May 01

Page 26

Philips Semiconductors Product specification

SYMBOL

PARAMETER

UNIT

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

80C575/83C575/

87C575

DC ELECTRICAL CHARACTERISTICS

= 0°C to +70°C and –40°C to +125°C, VCC = 5V ±10%, VSS = 0V

amb

LIMITS

8 5

MAX

VCC+0.5 V

0.50

0.45

30 12 75

TEST

CONDITIONS

IL1

IL2

IH1

IH2

IH3

Input low voltage (Ports 0, 2, 3, except 3.2, 3.3) –0.5 0.5VCC–0.6 V Input low voltage (Ports 1, 3.2, 3.3, XTAL1, RST) –0.5 0.2VCC–0.5 V Input low voltage (EA) 0 0.2VCC–0.45 V Input high voltage (Ports 0, 2, 3, except 3.2, 3.3) 0.5VCC+0.8 VCC+0.5 V Input high voltage (Ports 1, 3.2, 3.3) 0.8VCC+0.3 VCC+0.5 V Input high voltage (EA) 0.2VCC+0.9 VCC+0.5 V Input high voltage (XTAL1, RST) 0.7V

MIN TYP

HYS Hysteresis (Ports 0, 2, 3, except 3.2, 3.3) 200 mV HYS1 Hysteresis (Ports 1, 3.2, 3.3) 50 mV V V V

V V V

V V I

TL1

OL OL1 OL2

OH OH1 OH2

IO CR

Output voltage low (Ports 1, 2, 3, except 3.1) IOL = 1.6mA 0.45 V Output voltage low (Ports 0, ALE, PSEN

)

IOL = 3.2mA 0.45 V

Output voltage low

P3.1 with bit cleared P3.1 with bit set

IOL = 10.0mA

= 1.6mA

Output voltage high (Ports 1, 2, 3, except P3.1) IOH = –30µA VCC–0.7 V Output voltage high (Port 0 in external bus mode, ALE, PSEN) IOH = –3.2mA VCC–0.7 V Output voltage high

P3.1 with bit cleared P3.1 with bit set

IOH = –10.0mA

= –1.6mA

VCC–1.5

VCC–1.5 Offset voltage comparator inputs –35 +35 mV Common mode range comparator inputs 0 V Logical 0 input current (Ports 1, 2, 3, except 3.1) VIN = 0.45V –75 µA Logical 1-to-0 transition current

(Ports 2, 3, except 3.1, 3.2, 3.3)

See Note 4 –600 µA

Logical 1-to-0 transition current (Ports 1, 3.2, 3.3) See Note 4 –450 µA Input leakage current (Port 0, Port2 in open drain mode) Input leakage current (EA, P3.1) 0.45 < VIN < V Input leakage current comparator inputs 0 < VIN < V Power supply current:

Active mode @ 16MHz

0.45 < VIN < V

See note 6

CC CC

2 40 µA

–10 +10 µA

–1.0 +1.0 µA

Idle mode @ 16MHz Power-down mode

R V C

RST

LOW

Internal reset pull-up resistor VIN = 0V 50 200 kΩ Low VCC detect voltage 4.0 4.45 V Pin capacitance

f = 1MHz 10 pF

NOTES: (SEE NEXT PAGE)

V V

mA mA

µA

1998 May 01

Page 27

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

NOTES TO THE DC ELECTRICAL CHARACTERISTICS TABLE:

1. Typical ratings are not guaranteed. The values listed are at room temperature, 5V.

2. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the V to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 transitions during bus operations. In the worst cases (capacitive loading > 100pF), the noise pulse on the ALE pin may exceed 0.8V . In such cases, it may be desirable to qualify ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input. I single output sinks more than 5mA and no more than two outputs exceed the test conditions.

3. Capacitive loading on ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the 0.9VCC specification when the address bits are stabilizing.

4. Pins of ports 1, 2 and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its maximum value when V

5. I

MAX at other frequencies can be determined from Figure 29.

6. See Figures 30 through 33 for I

7. Load capacitance for port 0, ALE, and PSEN

8. Under steady state (non-transient) conditions, I

Maximum I Maximum I Maximum total I

If I

exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed

test conditions.

9. Specification applies to Port 2 when P2OD bit is set.

10.15pF MAX for the EA

per port pin: 10mA

per 8-bit port: 26mA

is between VIH and VIL.

test conditions.

for all outputs: 71mA

/VPP and P0.0 pins.

= 100pF, load capacitance for all other outputs = 80pF.

must be externally limited as follows:

s of ALE and ports 1 and 3. The noise is due

can exceed these conditions provided that no

80C575/83C575/

87C575

1998 May 01

Page 28

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

80C575/83C575/

87C575

AC ELECTRICAL CHARACTERISTICS

= 0°C to +70°C and –40°C to +125°C, VCC = 5V ±10%, VSS = 0V

amb

SYMBOL FIGURE PARAMETER MIN MAX UNIT

1/t

CLCL

22 Oscillator frequency: Speed Versions

8XC575 E 6 16 MHz OSCF Oscillator fail detect frequency 0.6 5.5 MHz TR Comparator response time 10 µs t

LHLL

AVLL

LLAX

LLIV

LLPL

PLPH

PLIV

PXIX

PXIZ

AVIV

PLAZ

22 ALE pulse width 2t 22 Address valid to ALE low t 22 Address hold after ALE low t 22 ALE low to valid instruction in 4t 22 ALE low to PSEN low t 22 PSEN pulse width 3t 22 PSEN low to valid instruction in 3t 22 Input instruction hold after PSEN 0 ns 22 Input instruction float after PSEN t 22 Address to valid instruction in 5t 22 PSEN low to address float 10 ns

Data Memory

RLRH

WLWH

RLDV

RHDX

RHDZ

LLDV

AVDV

LLWL

AVWL

QVWX

WHQX

RLAZ

WHLH

23, 24 RD pulse width 6t 23, 24 WR pulse width 6t 23, 24 RD low to valid data in 5t 23, 24 Data hold after RD 0 ns 23, 24 Data float after RD 2t 23, 24 ALE low to valid data in 8t 23, 24 Address to valid data in 9t 23, 24 ALE low to RD or WR low 3t 23, 24 Address valid to WR low or RD low 4t 23, 24 Data valid to WR transition t 23, 24 Data hold after WR t 23, 24 RD low to address float 0 ns 23, 24 RD or WR high to ALE high t

External Clock

CHCX

CLCX

CLCH

CHCL

26 High time 12 ns 26 Low time 12 ns 26 Rise time 20 ns 26 Fall time 20 ns

Shift Register

XLXL

QVXH

XHQX

XHDX

XHDV

25 Serial port clock cycle time 12t 25 Output data setup to clock rising edge 10t 25 Output data hold after clock rising edge 2t 25 Input data hold after clock rising edge 0 ns 25 Clock rising edge to input data valid 10t

NOTES:

1. Parameters are valid over operating temperature range unless otherwise specified.

2. Load capacitance for port 0, ALE, and PSEN

= 100pF, load capacitance for all other outputs = 80pF.

3. Interfacing the 80C32/52 to devices with float times up to 45ns is permitted. This limited bus contention will not cause damage to Port 0 drivers.

1, 2

VARIABLE CLOCK

–40 ns

CLCL

–25 ns

CLCL

–25 ns

CLCL

–75 ns

CLCL

–25 ns

CLCL

–45 ns

CLCL

–70 ns

CLCL

–25 ns

CLCL

–85 ns

CLCL

–100 ns

CLCL

–100 ns

CLCL

–110 ns

CLCL

–28 ns

CLCL

–150 ns

CLCL

–165 ns

CLCL

–50 3t

CLCL

–75 ns

CLCL

–30 ns

CLCL

–25 ns

CLCL

–25 t

CLCL

–133 ns

CLCL

–60 ns

CLCL

+50 ns

CLCL

+25 ns

CLCL

–133 ns

CLCL

1998 May 01

Page 29

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

EXPLANATION OF THE AC SYMBOLS

Each timing symbol has five characters. The first character is always ‘t’ (= time). The other characters, depending on their positions, indicate the name of a signal or the logical status of that signal. The designations are: A – Address C – Clock D – Input data H – Logic level high I – Instruction (program memory contents) L – Logic level low, or ALE

ALE

PSEN

PORT 0

LHLL

P – PSEN Q – Output data R–RD

signal t – Time V – Valid W– WR

signal X – No longer a valid logic level Z – Float Examples: t

= Time for address valid to

AVLL

ALE low.

=Time for ALE low to

LLPL

PSEN

low.

AVLL

LLPL

LLAX

A0–A7 A0–A7

LLIV

PLIV

PLPH

PLAZ

PXIX

INSTR IN

PXIZ

80C575/83C575/

87C575

ALE

PSEN

PORT 0

PORT 2

AVLL

LLAX

A0–A7

FROM RI OR DPL

AVWL

AVIV

A0–A15 A8–A15

Figure 22. External Program Memory Read Cycle

WHLH

LLDV

LLWL

RLAZ

AVDV

P2.0–P2.7 OR A8–A15 FROM DPF A0–A15 FROM PCH

RLDV

RLRH

RHDZ

RHDX

DATA IN A0–A7 FROM PCL INSTR IN

SU00006

1998 May 01

SU00025

Figure 23. External Data Memory Read Cycle

Page 30

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

ALE

WHLH

PSEN

WLWH

WHQX

QVWH

DATA OUT A0–A7 FROM PCL INSTR IN

PORT 0

PORT 2

AVLL

LLAX

A0–A7

FROM RI OR DPL

AVWL

LLWL

QVWX

P2.0–P2.7 OR A8–A15 FROM DPF A0–A15 FROM PCH

80C575/83C575/

87C575

INSTRUCTION

ALE

CLOCK

OUTPUT DATA

WRITE TO SBUF

INPUT DATA

CLEAR RI

SU00026

Figure 24. External Data Memory Write Cycle

012345678

XLXL

QVXH

XHDV

VALID VALID VALID VALID VALID VALID VALID VALID

XHQX

1230 4567

XHDX

SET TI

SET RI

SU00027

Figure 25. Shift Register Mode Timing

VCC–0.5

0.45V

0.7V

0.2VCC–0.1

CHCL

CLCX

CLCL

CHCX

CLCH

SU00009

Figure 26. External Clock Drive

1998 May 01

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Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

VCC–0.5

0.45V

NOTE: AC inputs during testing are driven at VCC –0.5 for a logic ‘1’ and 0.45V for a logic ‘0’. Timing measurements are made at VIH min for a logic ‘1’ and VIL max for a logic ‘0’.

Figure 27. AC Testing Input/Output

+0.1V

LOAD

NOTE: For timing purposes, a port is no longer floating when a 100mV change from load voltage occurs, and begins to float when a 100mV change from the loaded V

LOAD

–0.1V

0.2V

+0.9

–0.1

0.2V

TIMING

REFERENCE

POINTS

OH/VOL

Figure 28. Float Waveform

level occurs. IOH/IOL ≥ ±20mA.

80C575/83C575/

87C575

SU00010

–0.1V

+0.1V

SU00011

(mA)

045 10 151620

FREQUENCY (MHz)

MAX ACTIVE

TYP ACTIVE

MAX IDLE

TYP IDLE

SU00245

Figure 29. ICC vs. FREQ

Valid only within frequency specifications of the device under test

1998 May 01

Page 32

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

(NC)

CLOCK SIGNAL

RST

XTAL2

XTAL1

Figure 30. ICC Test Condition, Active Mode

All other pins are disconnected

RST

SU00246

80C575/83C575/

87C575

(NC)

CLOCK SIGNAL

XTAL2

XTAL1

SU00247

Figure 31. ICC Test Condition, Idle Mode

All other pins are disconnected

VCC–0.5

0.45V

0.7V

0.2VCC–0.1

CHCL

CLCX

CLCL

CHCX

CLCH

SU00009

Figure 32. Clock Signal Waveform for ICC Tests in Active and Idle Modes

= t

CHCL

= 5ns

CLCH

1998 May 01

Page 33

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

SU00248

= 2V to 5.5V

RST

(NC)

XTAL2

XTAL1

Figure 33. ICC Test Condition, Power Down Mode

All other pins are disconnected. V

80C575/83C575/

87C575

1998 May 01

Page 34

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

EPROM CHARACTERISTICS

To put the 87C575 in the EPROM programming mode, PSEN must be held high during power up, then driven low with reset active. The 87C575 is programmed by using a modified Quick-Pulse Programming algorithm. It differs from older methods in the value used for V voltage) and in the width and number of the ALE/PROG

The 87C575 contains two signature bytes that can be read and used by an EPROM programming system to identify the device. The signature bytes identify the device as an 87C575 manufactured by Philips.

Table 3 shows the logic levels for reading the signature byte, and for programming the program memory , the encryption table, and the security bits. The circuit configuration and waveforms for quick-pulse programming are shown in Figures 34 and 35. Figure 36 shows the circuit configuration for normal program memory verification.

(programming supply

pulses.

Quick-Pulse Programming

The setup for microcontroller quick-pulse programming is shown in Figure 34. Note that the 87C575 is running with a 4 to 6MHz oscillator. The reason the oscillator needs to be running is that the device is executing internal address and program data transfers.

The address of the EPROM location to be programmed is applied to ports 1 and 2, as shown in Figure 34. The code byte to be programmed into that location is applied to port 0. RST, PSEN specified in Table 3 are held at the ‘Program Code Data’ levels indicated in Table 3. The ALE/PROG in Figure 35.

To program the encryption table, repeat the 25 pulse programming sequence for addresses 0 through 1FH, using the ‘Pgm Encryption Table’ levels. Do not forget that after the encryption table is programmed, verification cycles will produce only encrypted data.

To program the security bits, repeat the 25 pulse programming sequence using the ‘Pgm Security Bit’ levels. After one security bit is programmed, further programming of the code memory and encryption table is disabled. However, the other security bit can still be programmed.

Note that the EA to go above the maximum specified V for any amount of time. Even a narrow glitch above that voltage can cause permanent damage to the device. The V should be well regulated and free of glitches and overshoot.

and pins of ports 2 and 3

is pulsed low 25 times as shown

/VPP pin must not be allowed

source

level

80C575/83C575/

87C575

Program Verification

If security bit 2 has not been programmed, the on-chip program memory can be read out for program verification. The address of the program memory locations to be read is applied to ports 1 and 2 as shown in Figure 36. The other pins are held at the ‘Verify Code Data’ levels indicated in Table 3. The contents of the address location will be emitted on port 0. External pull-ups are required on port 0 for this operation.

If the encryption table has been programmed, the data presented at port 0 will be the exclusive NOR of the program byte with one of the encryption bytes. The user will have to know the encryption table contents in order to correctly decode the verification data. The encryption table itself cannot be read out.

Reading the Signature Bytes

The signature bytes are read by the same procedure as a normal verification of locations 030H and 031H, except that P3.6 and P3.7 need to be pulled to a logic low. The values are: (030H) = 15H indicates manufactured by

Philips

(B0H) = 97H indicates 87C575

Program/Verify Algorithms

Any algorithm in agreement with the conditions listed in Table 3, and which satisfies the timing specifications, is suitable.

Table 3. EPROM Programming Modes

MODE RST PSEN ALE/PROG EA/V

Read signature 0 0 1 1 0 0 0 0 Program code data 0 0 0* V Verify code data 0 0 1 1 0 0 1 1 Pgm encryption table 0 0 0* V Pgm security bit 1 0 0 0* V Pgm security bit 2 0 0 0* V

NOTES:

1. ‘0’ = Valid low for that pin, ‘1’ = valid high for that pin. = 12.75V ±0.25V.

2. V

3. V

= 5V±10% during programming and verification.

* ALE/PROG

minimum of 10µs.

Trademark phrase of Intel Corporation.

receives 25 programming pulses while VPP is held at 12.75V . Each programming pulse is low for 100 µs (±10µs) and high for a

PP PP PP

P2.7 P2.6 P3.7 P3.6

1 0 1 1

1 0 1 0 1 1 1 1 1 1 0 0

1998 May 01

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Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

ALE/PROG

PSEN

P2.7

P2.6

P2.0–P2.4

4–6MHz

A0–A7

0 1 1

RST P3.6

P3.7 XTAL2

XTAL1

87C575

Figure 34. Programming Configuration

80C575/83C575/

87C575

+5V

PGM DATA

+12.75V 25 100µs PULSES TO GROUND 0 1

A8–A12

SU00249

ALE/PROG:

1 0

4–6MHz

1 0

A0–A7

25 PULSES

100µs+1010µs MIN

SU00018

Figure 35. PROG Waveform

+5V

ALE/PROG

PSEN

P2.7

P2.6

P2.0–P2.4

0 1 1

RST P3.6

P3.7 XTAL2

XTAL1

87C575

PGM DATA

1 1 0

0 ENABLE

A8–A12

1998 May 01

Figure 36. Program Verification

SU00250

Page 36

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

EPROM PROGRAMMING AND VERIFICATION CHARACTERISTICS

= 21°C to +27°C, VCC = 5V±10%, VSS = 0V (See Figure 37)

amb

SYMBOL

1/t

CLCL

AVGL

GHAX

DVGL

GHDX

EHSH

SHGL

GHSL

GLGH

AVQV

ELQZ

EHQZ

GHGL

Programming supply voltage 12.5 13.0 V Programming supply current 50 mA Oscillator frequency 4 6 MHz Address setup to PROG low 48t Address hold after PROG 48t Data setup to PROG low 48t Data hold after PROG 48t P2.7 (ENABLE) high to V VPP setup to PROG low 10 µs VPP hold after PROG 10 µs PROG width 90 110 µs Address to data valid 48t ENABLE low to data valid 48t Data float after ENABLE 0 48t PROG high to PROG low 10 µs

PARAMETER MIN MAX UNIT

48t

80C575/83C575/

87C575

CLCL CLCL CLCL CLCL CLCL

CLCL CLCL CLCL

PROGRAMMING* VERIFICATION*

P1.0–P1.7 P2.0–P2.4

PORT 0

DVGL

ALE/PROG

EA/V

P2.7 ENABLE

* FOR PROGRAMMING VERIFICATION SEE FIGURE 34.

FOR VERIFICATION CONDITIONS SEE FIGURE 36.

AVGL

EHSH

GLGH

SHGL

ADDRESS ADDRESS

AVQV

DATA IN DATA OUT

GHDX

GHAX

GHGL

LOGIC 0

GHSL

LOGIC 1 LOGIC 1

ELQV

Figure 37. EPROM Programming and Verification

EHQZ

SU00020

1998 May 01

Page 37

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

DIP40: plastic dual in-line package; 40 leads (600 mil) SOT129-1

80C575/83C575/

87C575

1998 May 01

Page 38

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

PLCC44: plastic leaded chip carrier; 44 leads SOT187-2

80C575/83C575/

87C575

1998 May 01

Page 39

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

QFP44: plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm SOT307-2

80C575/83C575/

87C575

1998 May 01

Page 40

Philips Semiconductors Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

Data sheet status

Objective specification

Preliminary specification

Product specification

Product status

Development

Qualification

Production

Definition

This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice.

This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make chages at any time without notice in order to improve design and supply the best possible product.

This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product.

[1]

80C575/83C575/

87C575

[1] Please consult the most recently issued datasheet before initiating or completing a design.

Definitions

Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For

detailed information see the relevant data sheet or data handbook. Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one

or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.

Disclaimers

Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can

reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.

Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.

Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088–3409 Telephone 800-234-7381

 Copyright Philips Electronics North America Corporation 1998

Date of release: 05-98

Document order number: 9397 750 03854

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1998 May 01