Remote Processing RPC-220 - Manual (Page 33)

EXTERNAL INTERRUPTS SECTION 10
Page 10-1
INTRODUCTION
EXTERNAL INTERRUPTS SECT ION 10
There are exter nal CPU interr upts: INT 0 and IN T 1. If
you do not use these interrupts, they may be used for
general purpose I/O or timing. See SE CTION 6,
DIGIT AL L INES, 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, inter nal to the CPU . T his allows
wire O R with othe r expan sion boar ds. S oftwar e will
have to poll the expansion boards to determine which
one caused the interr upt.
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 CP U process. For setup
example, see the program below.
F i le n am e Description
R T C\ R TC -3 . C Uses IN T 1 to wa ke up fro m idle
mode. INT 0 is similarly
program med.