Datasheet

Section 17 Keyboard Buffer Controller
Rev. 3.00 Mar 21, 2006 page 502 of 788
REJ09B0300-0300
Receive data processing
Clear KBF flag
(KCLK = High)
Processing 1
Receive operation ends
normally
[1] On the system side, drive the KCLK pin low,
setting the I/O inhibit state.
[1]
Transmit enabled state.
If there is transmit data,
the data is transmitted.
Figure 17.7 (2) Sample Receive Abort Processing Flowchart
Keyboard side monitors clock during
receive operation (transmit operation
as seen from keyboard), and aborts
receive operation during this period.
KCLK
(pin state)
KD
(pin state)
KCLK
(input)
KCLK
(output)
KD
(input)
KD
(output)
Reception in progress Receive abort request
Transmit operation
Start bit
Figure 17.8 Receive Abort and Transmit Start
(Transmission/Reception Switchover) Timing