P83C524 datasheet(22/76 Pages) PHILIPS

22 / 76 page

1997 Dec 15

Philips Semiconductors

Product speciﬁcation

8-bit microcontrollers

P83C524; P80C528; P83C528

10 I/O FACILITIES

The P83C528 has four 8-bit ports. Ports 0-3 are the same

as in the 80C51, with the exception of the additional

function of Port 1. Port lines P1.0 and P1.1 may be used

as inputs for Timer 2, P1.1 may also be used as an

additional (third) external interrupt request input. Port lines

P1.6 and P1.7 may be selected as the SCL and SDA lines

of Serial Port SIO1 (I2C). Because the I2C-bus may be

active while the device is disconnected from VDD, these

pins are provided with open drain drivers. Pins P1.6 and

P1.7 do not have pull-up devices when used as ports.

Ports 0, 1, 2, and 3 perform the following alternative

functions:

• Port 0: provides the multiplexed low-order address and

data bus used for expanding the P83C528 with standard

memories and peripherals.

• Port 1: pins can be configured individually to provide:

external interrupt request input (external interrupt 2);

external inputs for Timer/counter 2; SCL and SDA for

the I2C interface.

• Port 2: provides the high-order address bus when

expanding the P83C528 with external program memory

and/or external data memory.

• Port 3: pins can be configured individually to provide:

external interrupt request inputs (external interrupt 0/1);

external inputs for Timer/counter 0 and

Timer/counter 1; Serial Port receiver input and

transmitter output control-signals to read and write

external data memory.

Bits which are not used for the alternative functions may be

used as normal bidirectional I/O pins. The generation or

use of a Port 1 or Port 3 pin as an alternative function is

carried out automatically by the P83C528 provided the

associated SFR bit is HIGH. Otherwise the port pin is held

at a logical LOW level.

Fig.13 I/O buffers in the P83C528 (Ports 1, 2 and 3 except P1.6 and P1.7).

handbook, full pagewidth

MLA513

input data

read port pin

2 oscillator

periods

strong pull-up

I/O PIN

PORT

+5 V

from port latch

INPUT

BUFFER

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