C505CA datasheet(8/76 Pages) SIEMENS

Part #	C505CA

Description	8-Bit CMOS Microcontroller

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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Semiconductor Group

1-5

Introduction

C505A

1.2

Pin Definitions and Functions

This section describes all external signals of the C505A with its function.

Table 1-1 :

Pin Definitions and Functions

Symbol

Pin Number

I/O

*)

Function

P1.0-P1.7

40-44,1-3

40

41

42

43

44

1

2

3

I/O

Port 1

is an 8-bit quasi-bidirectional port with internal pull-up

arrangement. Port 1 pins can be used for digital input/output

or as analog inputs of the A/D converter. Port 1 pins that

have 1’s written to them are pulled high by internal pull-up

transistors 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 pullup transistors. Port 1 pins are assigned to be

used as analog inputs via the register P1ANA.

As secondary digital functions, port 1 contains the interrupt,

timer, clock, capture and compare pins. The output latch

cor re spon din g to a secon dar y fu ncti on mu st be

programmed to a one (1) for that function to operate (except

for compare functions). The secondary functions are

assigned to the pins of port 1 as follows:

P1.0 / AN0 / INT3 / CC0

Analog input channel 0

interrupt 3 input /

capture/compare channel 0 I/O

P1.1 / AN1 / INT4 / CC1

Analog input channel 1/

interrupt 4 input /

capture/compare channel 1 I/O

P1.2 / AN2 / INT5 / CC2

Analog input channel 2 /

interrupt 5 input /

capture/compare channel 2 I/O

P1.3 / AN3 / INT6 / CC3

Analog input channel 3

interrupt 6 input /

capture/compare channel 4 I/O

P1.4 / AN4

Analog input channel 4

P1.5 / AN5 / T2EX

Analog input channel 5 / Timer 2

external reload / trigger input

P1.6 / AN6 / CLKOUT

Analog input channel 6 /

system clock output

P1.7 / AN7 / T2

Analog input channel 7 /

counter 2 input

*) I = Input

O = Output

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