P80C562 查看數據表（PDF） - Philips Electronics

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P80C562

8-bit microcontroller

Philips Electronics 

Philips Semiconductors

8-bit microcontroller

Product specification

P83C562; P80C562

9 I/O FACILITIES

The P8xC562 has six 8-bit ports. Ports 0 to 3 are the same

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

functions of Port 1. The parallel I/O function of Port 4 is

equal to that of Ports 1, 2 and 3. Port 5 has a parallel input

port function, but has no function as an output port.

Ports 0 to 5 perform the following alternative functions:

Port 0 Provides the multiplexed low-order address and

data bus used for expanding the P8xC562 with

standard memories and peripherals.

Port 1 is used for a number of special functions:

• 4 capture inputs (or external interrupt request inputs if

capture information is not utilized)

• External counter input

• External counter reset input.

Port 2 Provides the high-order address bus when

expanding the P8xC562 with external program

memory and/or external data memory.

Port 3 Pins can be configured individually to provide:

• External interrupt request inputs

• Counter inputs

• Serial port receiver input and transmitter output

• Control signals to READ and WRITE external data

memory.

Port 4 Can be configured to provide signals indicating a

match between timer counter T2 and its compare

registers.

Port 5 May be used in conjunction with the ADC interface.

Unused analog inputs can be used as digital inputs.

As Port 5 lines may be used as inputs to the ADC,

these digital inputs have an inherent hysteresis to

prevent the input logic from drawing too much

current from the power lines when driven by analog

signals. Channel-to-channel crosstalk should be

taken into consideration when both digital and

analog signals are simultaneously input to Port 5

(see Chapter 20).

All ports are bidirectional with the exception of Port 5 which

is an input port. Alternative function bits which are not used

may be used as normal bidirectional I/O pins.

The generation or use of a Port 1, Port 3 or Port 4 pin as

an alternative function is carried out automatically by the

P8xC562 provided the associated Special Function

Register bit is set HIGH.

In addition to the standard 8-bit ports, the I/O facilities of

the P8xC562 also include a number of special I/O lines.

handbook, full pagewidth

Q

from port latch

input data

read port pin

2 oscillator

periods

strong pull-up

p1

n

INPUT

BUFFER

+5 V

p2

p3

I/O PIN

PORT

I1

MLA513

Fig.7 I/O buffers in the P8xC562 (Ports 2, 3, 4 and P1.0 to P1.5).

1997 Apr 08

13

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