C505A-4E データシートの表示（PDF） - Siemens AG

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C505A-4E

8-Bit CMOS Microcontroller

Siemens AG 

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

P1.0-P1.7

Pin Number I/O

*)

40-44,1-3

I/O

Function

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

corresponding to a secondary function must 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:

40

P1.0 / AN0 / INT3 / CC0 Analog input channel 0

interrupt 3 input /

capture/compare channel 0 I/O

41

P1.1 / AN1 / INT4 / CC1 Analog input channel 1/

interrupt 4 input /

capture/compare channel 1 I/O

42

P1.2 / AN2 / INT5 / CC2 Analog input channel 2 /

interrupt 5 input /

capture/compare channel 2 I/O

43

P1.3 / AN3 / INT6 / CC3 Analog input channel 3

interrupt 6 input /

capture/compare channel 4 I/O

44

P1.4 / AN4

Analog input channel 4

1

P1.5 / AN5 / T2EX

Analog input channel 5 / Timer 2

external reload / trigger input

2

P1.6 / AN6 / CLKOUT Analog input channel 6 /

system clock output

3

P1.7 / AN7 / T2

Analog input channel 7 /

counter 2 input

*) I = Input

O = Output

Semiconductor Group

1-5

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