SAB-80C517A-N18 데이터 시트보기 (PDF) - Siemens AG

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SAB-80C517A-N18

High-Performance 8-Bit CMOS Single-Chip Microcontroller

Siemens AG 

SAB 80C517A/83C517A-5

Pin Definitions and Functions (cont’d)

Symbol

Pin Number

I/O *) Function

P-LCC-84 P-MQFP-100-2

P1.7 - P1.0 29 - 36

98 - 100,

1, 6 - 9

I/O Port 1

is a bidirectional I/O port with internal

pull-up resistors. Port 1 pins that have

1 s written to them are pulled high by the

internal pull-up resistors, and in that state

can be used as inputs. As inputs, port 1

pins being externally pulled low will source

current (IIL, in the DC characteristics)

because of the internal pull-up resistors. It

is used for the low order address byte

during program verification. It also contains

the interrupt, timer, clock, capture and

compare pins that are used by various

options. The output latch must be

programmed to a one (1) for that function to

operate (except when used for the compare

functions).

The secondary functions are assigned to

the port 1 pins as follows:

– INT3/CC0 (P1.0): interrupt 3 input/

compare 0 output /capture 0 input

– INT4/CC1 (P1.1): interrupt 4 input /

compare 1 output /capture 1 input

– INT5/CC2 (P1.2): interrupt 5 input /

compare 2 output /capture 2 input

– INT6/CC3 (P1.3): interrupt 6 input /

compare 3 output /capture 3 input

– INT2/CC4 (P1.4): interrupt 2 input /

compare 4 output /capture 4 input

– T2EX (P1.5):

timer 2 external

reload trigger input

– CLKOUT (P1.6): system clock output

– T2 (P1.7):

counter 2 input

* I = Input

O = Output

Semiconductor Group

10

1994-05-01

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