SAB-80C517A-N18-T3 Просмотр технического описания (PDF) - Siemens AG

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SAB-80C517A-N18-T3

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

P6.0 - P6.7 70 - 77

46 - 50,

54 - 56

I/O Port 6

is a bidirectional I/O port with internal pull-

up resistors. Port 6 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 6

pins being externally pulled low will source

current (I IL, in the DC characteristics)

because of the internal pull-up resistors.

Port 6 also contains the external A/D

converter control pin and the transmit and

receive pins for serial channel 1. 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 6, as follows:

– ADST (P6.0): external A/D converter

start pin

– R × D1 (P6.1): receiver data input

of serial interface 1

– T × D1 (P6.2): transmitter data output

of serial interface 1

P8.0 - P8.3 78 - 81

57 - 60

I Port 8

is a 4-bit unidirectional input port. Port pins

can be used for digital input, if voltage

levels meet the specified input high/low

voltages, and for the higher 4-bit of the

multiplexed analog inputs of the A/D

converter, simultaneously

* I = Input

O = Output

Semiconductor Group

14

1994-05-01

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