Commands - 87

ON INP

Tasking Statement

SYNTAX: ON INP n, address, mask, compare GOSUB line/label

PURPOSE: To cause an interr upt when a preset inpu t bit pattern is detected in an inpu t port.

REMARK S: The task is similar to ON BIT. However, you can look at any or all of the 8 bits on a port. An

interrupt occurs when the bit pattern is recognized.

The interrupt will occur on the first instance of the pattern match. It will not interrupt again until the

inputs change and then change back to match the pattern. This is sometimes called an “edge

triggered” mode.

The parameter n is the task number. It ranges from 0 to 7.

The address is the I/O address of the port to be read.

The mask parameter determines which bits are of interest. Each bit in the mask that is a “1” is a bit

of interest.

When the data at the port matches the compare parameter, an interrupt occurs and the program

branches to the line/label. Up to 8 conditions may be tested on the same por t or differ ent ports

See the Multitasking Chapter for more information.

RELATED: START INP, STOP INP

EXAMPLE: 10 ON INP 0,3,7,5 GOSUB 60

20 START INP 0

30 PRINT BIN$(INP(0))

40 DELAY .25

50 GOTO 30

60 PRINT "match"

70 RETURN

ERROR: < Data negative> – all parameters

< Data out of range> – if n>7

< Data > 255> – for mask and compare

< Data > 65,535> – for address

< Can’t compile> – if line/label not found

1 2 ... 115 116 117 118 119 120 121 122 123 124 125 ... 207 208

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