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Fabricante

Q67120-C889

8-Bit CMOS Microcontroller

Infineon Technologies 

C502

Pin Definitions and Functions (cont’d)

Symbol

P3.0 – P3.7

Pin Number

P-LCC-44 P-DIP-40

11, 13–19 10–17

I/O*) Function

I/O Port 3

is a bidirectional I/O port with internal pull-up

resistors. Port 3 pins that have 1s written to

them are pulled high by the internal pull-up

resistors, and in that state can be used as

inputs. As inputs, port 3 pins being externally

pulled low will source current (IIL, in the DC

characteristics) because of the internal pull-up

resistors. Port 3 also contains the interrupt,

timer, serial port 0 and external memory strobe

pins that are used by various options. The out-

put latch corresponding to a secondary func-

tion must be programmed to a one (1) for that

function to operate.

The secondary functions are assigned to the

pins of port 3, as follows:

11

10

13

11

14

12

15

13

16

14

17

15

18

16

19

17

P3.0

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P3.7

R×D

T×D

INT0

INT1

T0

T1

WR

RD

receiver data input

(asynchronous) or data input/

output (synchronous) of serial

interface 0

transmitter data output

(asynchronous) or clock output

(synchronous) of the serial

interface 0

interrupt 0 input/timer 0 gate

control

interrupt 1 input/timer 1 gate

control

counter 0 input

counter 1 input

the write control signal latches

the data byte from port 0 into the

external data memory

the read control signal enables

the external data memory to

port 0

XTAL2

20

18

– XTAL2

Output of the inverting oscillator amplifier

*)I = Input

O = Output

Semiconductor Group

8

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