Remote-processing BASIC 52 Bedienungsanleitung PDF herunterladen (Seite 43)

RPBASIC-52 PROGRAMMING GUIDE

2-24

COUNT (function)

Syntax: A = COUNT(counter)

Where: counter = 0 - 1, or 4 - 11

Function: Reads a multimode hardware or software counter

Mode: Command, Run

Use: A = COUNT(0)

Cards: RPC-320, RPC-330

DESCRIPTION

RPBASIC-52 recognizes a hardware and software counter. The hardware counter is 24 bits wide from a LSI

7166 chip. (Your board may use a different kind. Please check your hardware manual.) The RPC-320 has

one of these and the RPC-330 has two. Additionally, there are 8 software counters on all cards.

counter 0 and 1 retrieve a 24 bit (3 byte) number from the LSI 7166 multimode counter IC. A number from 0

to 16777215 is returned. See your hardware manual for more information about using the LSI 7166 chip.

Eight software counters, set by the ON COUNT command, return a count from 0 to 65535. Software counter

is 4 to 11. A software count is incremented when a line goes low.

COUNT (statement), ON COUNT

ERROR

BAD ARGUMENT When counter is out of range

EXAMPLE

The following example sets up line 3 as a software counter input. A count is printed once a second. A count

is incremented by bringin g line 3 low m omentarily.

10 ON COUNT4,3

20 ONTICK 1,1000

30 IDLE

40 GOTO 30

1000 PRINT COUNT(4)

1010 RETI

ON COUNT can be configured to generate an interrupt when a specified number of counts is reached. See

COUNT MULTITASKING under MU LTITA SKING CONSTRU CTS at the beginning of this m anual.

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Remote-processing BASIC 52 Bedienungsanleitung Seite 43