Remote-processing RPC-210 Manuel d'utilisateur télécharger pdf (Page 41)

EXTERNAL INTERRUPTS SECTION 9

Page 9-1

Figure 9-1 Interrupt inputs at Connectors

INTRODUCTION

EXTERNAL INTERRUPTS SECTION 9

External CPU interrupt INT 0 is available for a number

of devices. INT 0 responds to low level signal at either

J7-3, J8-6, or J11-8 by executing code declared by

ONIT R when the curr ent RPBA SIC-52 instruction is

finished. Usually, this is less than 5 mSec.

INT 0

This interrupt line goes to J7-3, J8-6, and J11-8. This

line has a 10K pull up. This allows wired OR operation

with other interr upts and expansion boar ds.

INT 0 can be used by the real time clock (J7-1) or

counter (at J11-8). The real time clock allows for wired

OR operation. The coun ter does not.

WARNING:

COM 1 serial port uses INT 0. If you are using

COM 1, you cannot use this interrupt.

Interrupt 0 is level sensitive. This means that as long as

the line at INT 0 is low, code starting at the line set in

ONITR will execute if an RETI instruction was given.

If a RETURN is given, then interrupts stay turned off.

The table below gives the source of interr upts.

Interrupt

0 Source

Description Wire

OR?

J7-1 Real time clock Y

J7-5 COM 1 UART Y

J7-4 Clock square wave N

J8-6 Expansion port N/A

J11-7 Counter carry N

J11-9 Counter Borrow N

J11-10 Quadrature latch N

J11-8 Counter port N/A

INT 0 is available at the following 3 connectors: J7-3,

J8-6, and J11-8.

Programming

The ONITR command is use d to enable and disable

hardware interrupts. The return from an interrupt uses

the RET I statement.

10 ONITR 0,500

20 A = A + 1

30 GOTO 20

500 PRINT A

510 A = 0

590 RETI

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 59 60

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Remote-processing RPC-210 Manuel d'utilisateur Page 41

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