SMAC
LAC-25 Technical Reference Manual
62
4.8 Input / Output (I/O) Commands
The user is able to manipulate the LAC-25's I/O channels via the use of several commands.
These include setting or clearing outputs, reading inputs and altering the logic type of both.
Command:
BIn
-- Bulk Input from I/O Port 'n' --
Argument:
0 <= n <= 7
This command reads the value at the 8-bit digital input port and copies it to the low 8-bits
of the accumulator with the lower channel being the lowest bit in the accumulator. The unused
bits of the accumulator will be set to 0. The state of the inputs will be determined by the Channel
High (CH) and Channel Low (CL) commands and the inputs will have been debounced if the Input
Debounce (ID) command is in effect.
Related Commands: BO
Command:
BOn
-- Bulk Output to I/O Port 'n' --
Argument:
0 <= n <= 7
This command copies the low 8-bits of the accumulator to the digital output port. The state
of the outputs will be determined by the Channel High (CH) and Channel Low (CL) commands.
Unused bits in the accumulator are ignored.
Related Commands: BI
Command:
CFn
-- Turn I/O Channel 'n' "Off" --
Argument:
0 <= n <= 63
Default:
"Off"
This command will cause I/O channel 'n' to assume the "off" state. The actual output state
will depend on whether the channel is set active "on" (CH command) or active "off" (CL command).
Related Commands: CH, CL, CN
Command:
CHn
-- Make I/O Channel 'n' Active High --
Argument:
0 <= n <= 63
Default:
Active high or active "on"
This command causes I/O channel 'n' to assume an active "on" mode.
Related Commands: CL
