C501 datasheet(9/48 Pages) INFINEON

9 / 48 page

Semiconductor Group

1997-04-01

C501

P3.0 – P3.7 11,

13–19

10–17

5, 7–13

I/O

Port 3

is a quasi-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 they can be used as inputs. As

inputs, port 3 pins being externally pulled

low will source current (

IL, 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 which are used by

various options. The output latch

corresponding to a secondary function

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:

P3.0

×D receiver data input (asyn-

chronous) or data input

output (synchronous) of

serial interface 0

P3.1

×D

transmitter data output

(asynchronous) or clock

output (synchronous) of

the serial interface 0

P3.2

INT0

interrupt 0 input/timer 0

gate control

P3.3

INT1

interrupt 1 input/timer 1

gate control

P3.4

counter 0 input

P3.5

counter 1 input

P3.6

the write control signal lat-

ches the data byte from

port 0 into the external

data memory

P3.7

the read control signal

enables the external data

memory to port 0

*) I

= Input

O = Output

Table 1

Pin Deﬁnitions and Functions (cont’d)

Symbol

Pin Number

I/O*) Function

P-LCC-44 P-DIP-40 P-MQFP-44

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