SAB-80C535-N datasheet(9/56 Pages) INFINEON

Part #	SAB-80C535-N

Description	8-Bit CMOS Single-Chip Microcontroller

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Manufacturer	INFINEON [Infineon Technologies AG]

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SAB 80C515/80C535

Semiconductor Group

8

Pin Definitions and Functions (cont’d)

Symbol

P-LCC-68

P-MQFP-80

Input (I)

Output (O)

Function

P3.0-P3.7 21-28

15-22

I/O

Port 3

is an 8-bit bidirectional I/O port with

internal pullup resistors. Port 3 pins that

have1'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 (IIL, 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:

–R

×D (P3.0): serial port's receiver data

input (asynchronous) or data input/

output (synchronous)

–T

×D (P3.1): serial port's transmitter data

output

(asynchronous) or clock output

(synchronous)

–INT0 (P3.2): interrupt 0 input/timer 0

gate control input

– INT1 (P3.3): interrupt 1 input/timer 1

gate control input

– T0 (P3.4): counter 0 input

– T1 (P3.5): counter 1 input

– WR (P3.6): the write control signal

latches the data byte from port 0 into the

external data memory

– RD (P3.7): the read control signal

enables the external data memory to

port 0

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