SAFC504 datasheet(10/71 Pages) INFINEON

10 / 71 page

C504

Data Sheet

2000-05

P3.0 - P3.7 5, 7 - 13

I/O

Port 3

is an 8-bit bidirectional port. P3.0 (R

×D) and P3.1

×D) operate as defined for the C501. P3.2 to P3.7

contain the external interrupt inputs, timer inputs,

and four of the analog inputs of the A/D converter.

Port 3 pins are assigned to be used as analog inputs

via the bits of SFR P3ANA. P3.6/WR can be

assigned as a third interrupt input.

The 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 / AN4 / INT0 Analog input channel 4 /

external interrupt 0 input /

Timer 0 gate control input

P3.3 / AN5 / INT1 Analog input channel 5 /

external interrupt 1 input /

Timer 1 gate control input

P3.4 / AN6 / T0

Analog input channel 6 / Timer 0

counter input

P3.5 / AN7 / T1

Analog input channel 7 / Timer 1

counter input

P3.6 / WR / INT2

WR control output; latches the

data byte from port 0 into the

external data memory /

external interrupt 2 input

P3.7 / RD

RD control output; enables the

external data memory

Table 1

Pin Definitions and Functions (cont’d)

Symbol

Pin Number

(P-MQFP-44)

I/O

Function

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