OKIDATA MICROLINE 320 - Page 24

2 – 16
OPTXD OPCLK OPRXD OPCLR-N
1232
31
6
7
5
or
8
bit0 bit7
Command (first)
Command (second)
Command response (first)
Command response (second)
Note
bit0 bit7
Reset within BU5148S
Power ON
Write instruction for LSI
reset
LSI write for LED data,
etc.
Read instruction for
data read
Response check
for OK or NG
Error notification
Instruction for
retransmission
1 2 3 4
7 8
5 6
NO
YES
Note: From the illustration above, you can see that the command and the command response are output at the same time. This is because
the bit 0 to bit 3 of the OPRXD signal are fixed so that the response can be returned before decoding the command.