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P83C591

Single-chip 8-bit microcontroller with CAN controller

Philips Electronics 

Philips Semiconductors

Single-chip 8-bit microcontroller with CAN controller

Preliminary Specification

P8xC591

6.2 Pin description

Table 1 Pin description for QFP44/PLCC44, see Note 1.

SYMBOL

RST

P3.0to P3.7

PIN

QFP44 PLCC44

DESCRIPTION

4

10

Reset: A Input to reset the P8xC591. It also provides a reset pulse as output

when Timer T3 overflows.

Port 3 (P3.0 to P3.7): 8-bit programmable I/O port lines; Port 3 can

sink/source 4 LSTTL inputs.

Port 3 pins serve alternate functions as follows:

P3.0/RXD

5

11

RXD: Serial input port for UART;

T2: T2 event input

P3.1/TXD

7

13

TXD: Serial output port for UART;

RT2: T2 timer reset signal. Rising edge triggered.

P3.2/INT0/CMSR0 8

14

INT0: External interrupt input 0;

CMSR0: Compare and Set/Reset output for Timer T2.

P3.3/INT1/

CMSR1

9

15

INT1: External interrupt input 1;

CMSR1: Compare and Set/Reset output for Timer T2.

P3.4/T0/CMSR2 10

16

T0: Timer 0 external interrupt input;

CMSR2: Compare and Set/Reset output for Timer T2.

P3.5/T1/CMSR3 11

17

T1: Timer 1 external interrupt input;

CMSR3: Compare and Set/Reset output for Timer T2.

P3.6/WR

12

18

WR: External Data Memory Write strobe;

P3.7/RD

13

19

RD: External Data Memory Read strobe.

During reset, Port 3 will be asynchronously driven resistive HIGH.

XTAL2

XTAL1

VSS

VDD

Port 3 has four modes selected on a per bit basis by writing to the P3M1 and

P3M2 registers as follows:

P3M1.x P3M2.x Mode Description

0

0 Pseudo-bidirectional (standard c51 configuration default)

0

1 Push-Pull

1

0 High impedance

1

1 Open drain

14

20

Crystal pin 2: output of the inverting amplifier that forms the oscillator. Left

open-circuit when an external oscillator clock is used.

15

21

Crystal pin 1: input to the inverting amplifier that forms the oscillator, and

input to the internal clock generator. Receives the external oscillator clock

signal when an external oscillator is used.

16

22

Ground; circuit ground potential.

17

23

Power supply; power supply pin during normal operation and power

reduction modes.

2000 Jul 26

9

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