Datasheet

Section 19 Keyboard Buffer Control Unit (PS2)
Rev. 2.00 Sep. 28, 2009 Page 604 of 994
REJ09B0452-0200
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 19.7 Sample Receive Abort Processing Flowchart (2)
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 19.8 Receive Abort and Transmit Start
(Transmission/Reception Switchover) Timing