Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 96)

RPBASIC-52 PROGRAMMING GUIDE

2-77

ONTICK

Syntax: ONTICK time,line number

Where: time = time interval from 0.01 to 327

line number = line to branch

Function: Calls subroutine at line number every time interval.

Mode: Run

Use: ONTICK 1.25,500

Cards: All

DESCRIPTION

ONTICK calls a subroutine every time interva l. time ranges from 0.010 seconds to 327.7 seconds

(approxima tely 5.5 minutes). time can be specified in increments as small as 0.005 seconds. ONTICK

interrupts are turned off when time = 0. A line number must still be provided even though it is not used.

The interval period can be reset at any time in a program. When an ONTICK statement is executed, an

interrupt will occur in time seconds. Time accumulated since the last interrupt is discarded.

NOTE: Use the RE TI com man d to exit this su broutine. Failure to do so prev ents future ONTICK interrup ts.

Make sure your ONTICK subroutine can finish before the next interrupt. If the program is in the subroutine

longer than the specified time interval, the next one will be missed.

This interrupt has the highest priority of any others. ONITR can interrupt any other routine, but no other

interrupt can take over this one.

RETI

ERRORS

BAD ARGUMENT When time > 327.6 or negative

BAD SYNTAX When any parameters left out

INVALID LINE When line number not found

EXAMPLE

The following example will interrupt 5 times before it is canceled at line 220.

10 A = .15

20 ONTICK A,200

30 IF C<4 THEN A=A+1 : GOTO 30

40 END

200 PRINT A

210 C = C + 1

220 IF C = 5 THEN ONTICK 0,200

230 RETI

>run

145.15

286.15

431.15

575.15

The IDLE com mand m ay be used to "wait" for an O NTICK interval interrupt.

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Remote-processing BASIC 52 Uživatelský manuál Strana 96