Remote-processing RPC-220 Manual de usuario descargar pdf (Pagina 33)

EXTERNAL INTERRUPTS SECTION 10

Page 10-1

INTRODUCTION

EXTERNAL INTERRUPTS SECTION 10

There are external CPU interr upts: INT 0 and INT 1. If

you do not use these interrupts, they may be used for

general purpose I/O or timing. See SECTION 6,

DIGITAL LINES, for curr ent capabilities and pin outs.

Both interrupts are 8051 compatible.

INT 0

This interrupt line goes to both J2-6 and J3-6. This line

has a soft pull up, internal to the CPU . This allows

wire O R with othe r expan sion boards. Softwar e will

have to poll the expansion boards to determine which

one caused the interrupt.

INT 1

INT 1 is meant to be a local interrupt for the RTC. In

addition, it goes to J3-23 so it may be triggered by

another external device.

APPLICATION PROGRAM

Interrupts are part of the CPU process. For setup

example, see the program below.

File name Description

RTC\RTC-3.C Uses IN T 1 to wake up from idle

mode. INT 0 is similarly

programmed.

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Remote-processing RPC-220 Manual de usuario Pagina 33