P80C562 Philips Semiconductors, P80C562 Datasheet - Page 13

• Manufacturer Part Number: P80C562
• Description: 8-bit microcontroller
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9
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
Port 1 is used for a number of special functions:
Port 2 Provides the high-order address bus when
Port 3 Pins can be configured individually to provide:
1997 Apr 08
handbook, full pagewidth
4 capture inputs (or external interrupt request inputs if
capture information is not utilized)
External counter input
External counter reset input.
External interrupt request inputs
Counter inputs
Serial port receiver input and transmitter output
Control signals to READ and WRITE external data
memory.
8-bit microcontroller
I/O FACILITIES
data bus used for expanding the P8xC562 with
standard memories and peripherals.
expanding the P8xC562 with external program
memory and/or external data memory.
from port latch
read port pin
input data
Q
Fig.7 I/O buffers in the P8xC562 (Ports 2, 3, 4 and P1.0 to P1.5).
2 oscillator
periods
BUFFER
INPUT
strong pull-up
13
Port 4 Can be configured to provide signals indicating a
Port 5 May be used in conjunction with the ADC interface.
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.
p1
n
match between timer counter T2 and its compare
registers.
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).
p2
I1
P83C562; P80C562
p3
I/O PIN
PORT
+5 V
Product specification
MLA513