3.27 EDH0162En1040 – 06/99
MM4005 CB — Clear I/O outputs bits
Usage IMM PGM MIP
Syntax xxCBnn
Parameters
Description xx
[int] — I/O bit number.
nn [float] — I/O bit mask.
Range xx — 0 to 8.
nn
— 0 to 255.
Units xx
— None.
nn — None.
Defaults xx Missing: 0.
Out of range: Error E.
Floating point: Error A.
nn Missing: 255.
Out of range: Error C.
Floating point: Decimal part truncated.
Description This command clears one to all output bits of the I/O port. If xx is specified
between 1 and 8, the nn mask must be missing and then the selected bit
will be cleared.
If
xx is missing or set to 0 and nn is between 1 and 255, the controller will
clear all bits corresponding to the mask. For example, if nn is 140, the
equivalent binary mask is 10001100 which means that I/O output bits num-
ber 3, 4 and 8 will be cleared (remember that I/O bits are numbered from 1
to 8).
If
xx is missing or set to 0 and nn is not specified, the controller clears all 8
bits. This is equivalent to setting xx to 0 and nn to 255.
NOTE
Remember that having an open collector configuration, a clear bit means
a non-conductive transistor. Using a pull-up resistor, a clear output bit
will measure a logic high, thus making the output port be the reverse
logic type.
NOTE
For the hardware definition of the I/O port, please see Appendix B,
Connector Pinouts, GPIO Connector.
Returns
None.
Errors A — Unknown message code.
E — Incorrect I/O channel number.
Rel. Commands RO — Read I/O output.
SB — Set I/O output bits.
SO — Set I/O output port byte.
TG — Toggle I/O output bits.
Example CB224 | Set I/O output port bits number 6, 7 and 8 low.
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