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Section 19 Keyboard Buffer Control Unit (PS2)
Processing 1
Receive operation ends
normally
Receive data processing
Clear KBF flag
(KCLK = High)
Transmit enabled state.
If there is transmit data,
the data is transmitted.
Figure 19.7 Sample Receive Abort Processing Flowchart (2)
Reception in progress
KCLK
(pin state)
KD
(pin state)
KCLK
(input)
KCLK
(output)
KD
(input)
KD
(output)
Rev. 1.00 May 09, 2008 Page 570 of 954
REJ09B0462-0100
[1]
Keyboard side monitors clock during
receive operation (transmit operation
as seen from keyboard), and aborts
receive operation during this period.
Receive abort request
Figure 19.8 Receive Abort and Transmit Start
(Transmission/Reception Switchover) Timing
[1] On the system side, drive the KCLK pin low, setting
the I/O inhibit state.
Transmit operation
Start bit
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