Remote-processing CAMBASIC Manual do Utilizador descarregar pdf (Página 121)

Commands - 88

ON ITR

Tasking Statement

SYNTAX: ON ITR n GOSUB line/label

ON ITR n GOSUB

PURPOSE: To enable or disable a progr am br anch due to an hardw are inter rupt.

REMARK S: Check your hardware manual to determine if this statement is active for your card. It is not active

for the RPC-2300 or RPC-150.

n = 0 or 1. These correspond to ITR 0 and IT R 1 as descr ibed in the har dwar e manual.

The ON ITR statement traps a hardware interrupt so software can service it. When a hardware

interrupt occurs, it sets an internal flag and that. interrupt is disabled. If an appropriate ON ITR has

been declared, a program branch will occur.

Hardware interrupts will remain disabled until a corresponding RETURN ITR statement has been

executed. If the subroutine ends with just a RETURN, the interrupt remains disabled. You can

cancel an ON ITR at any time by executing the statement without a line number.

NOTE: Not all hardware pr oducts implement a hardware interr upt. See your C PU card user’s

manual.

RELATED: RETURN ITR

EXAMPLE: 10 ON ITR 0 GOSUB..clock

20 .

30 .

40 .

50 ..clock

60 BIT 1,1,OFF 'turn whatever off

70 RETURN ITR 0

ERRORS: < Can’t compile> – if line/label does not exist

< Command not available> – if not implemented on your card

< Data out of range> - when n is not 0 or 1

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Remote-processing CAMBASIC Manual do Utilizador Página 121