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Semiconductor Group 1-6

Introduction

C501

1.2 Pin Definitions and Functions

This section describes all external signals of the C501 with its function.

Table 1-1

Pin Definitions and Functions

Symbol Pin Number I/O*) Function

P-LCC-44 P-DIP-40 P-MQFP-44

P1.0 – P1.7 2–9

1–8

40–44,

1–3,

I/O Port 1

is a quasi-bidirectional I/O port with

internal pull-up resistors. Port 1 pins that

have 1s written to them are pulled high by

the internal pullup resistors, and in that

state can be used as inputs. As inputs,

port 1 pins being externally pulled low will

source current (

, in the DC character-

istics) because of the internal pull-up

resistors. Port 1 also contains the timer 2

pins as secondary function. The output

latch corresponding to a secondary

function must be pro-grammed to a one

(1) for that function to operate.

The secondary functions are assigned to

the pins of port 1, as follows:

P1.0 T2 Input to counter 2

P1.1 T2EX Capture - Reload trigger of

timer 2 / Up-Down count

*) I = Input

O = Output

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 120 121

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