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Q67121-C1070

8-Bit CMOS Microcontroller

Infineon Technologies 

C515A

Table 1

Pin Definitions and Functions (cont’d)

Symbol

P3.0-P3.7

*) I = Input

O = Output

Pin Number

(P-MQFP-80)

15-22

15

16

17

18

19

20

21

22

I/O*)

I/O

Function

Port 3

is an 8-bit quasi-bidirectional I/O port with internal pullup

resistors. Port 3 pins that have 1's written to them are

pulled high by the internal pullup resistors, and in that

state can be used as inputs. As inputs, port 3 pins being

externally pulled low will source current (I IL, in the DC

characteristics) because of the internal pullup resistors.

Port 3 also contains the interrupt, timer, serial port and

external memory strobe pins that 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 / RxD

Receiver data input (asynch.)

or data input/output (synch.)

of serial interface

P3.1 / TxD

Transmitter data output

(asynch.) or clock output

(synch.) of serial interface

P3.2 / INT0

External interrupt 0 input /

timer 0 gate control input

P3.3 / INT1

External interrupt 1 input /

timer 1 gate control input

P3.4 / T0

Timer 0 counter input

P3.5 / T1

Timer 1 counter input

P3.6 / WR

WR control output; latches

the data byte from port 0 into

the external data memory

P3.7 / RD

RD control output; enables

the external data memory

Semiconductor Group

8

1997-10-01

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