SAB80C515 데이터 시트보기 (PDF) - Siemens AG

부품명

상세내역

제조사

SAB80C515

8-Bit CMOS Single-Chip Microcontroller

Siemens AG 

SAB 80C515/80C535

Pin Definitions and Functions (cont’d)

Symbol Pin

Pin

Input (I) Function

P-LCC-68 P-MQFP-80 Output (O)

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

Semiconductor Group

8

Share Link: