B - Bit Clear
SYNTAX
Bbit
Clear
bit
to logic 0, where
bit =
bit value from
1
to
40
.
B?
Returns
bit
of the last bit that was cleared.
DESCRIPTION
The Bit Clear (
B
) command clears to a logic 0 an output bit described by the argument
bit
. Clearing a bit may
represent either a 0 volt or a +5 volt output, depending on whether an Invert command (
I16
) has been sent. If data is
active high (default condition), then Bit Clear outputs 0 volts. If multiple bits are to be cleared within the same
command string, then an Execute (
X
) command must follow every Bit Clear (
B
) command.
To be valid, the bit being cleared must have been configured as an output bit, by the Configuration (
C
) command. The
Data Strobe output line is not pulsed when the Bit Clear (
B
) command is sent.
CAUTION
Because the Configuration (C) command is used, the following programming
example(s) will not work properly if the HVCX1 option is installed with a conflicting
hardware configuration. To be safe, remove the HVCX1 board and replace it with the
jumper board to run the example(s).
EXAMPLE
PRINT#1,"CLEAR08"
Line 1:
Reset the Digital488/80A.
PRINT#1,"OUTPUT08;C5P0X"
Line 2:
Configure all 5 ports as output; select all 5 ports.
PRINT#1,"OUTPUT08;A7X A8X A9X"
Line 3:
Set Bits 7, 8, 9 to a logic 1 (+5 volts).
PRINT#1,"OUTPUT08;B7X"
Line 4:
Clear Bit 7 to a logic 0 (0 volts).
PRINT#1,"OUTPUT08;B8X B9X"
Line 5:
Clear Bits 8 and 9 to a logic 0 (0 volts).
48 Digital488/80A Commands
967695
Digital488/80A User's Manual
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