Section 19 Keyboard Buffer Control Unit (PS2)
Rev. 1.00 Apr. 28, 2008 Page 602 of 994
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1
2
8
9
0
1
7
10
11
KCLK
(pin state)
KCLK
(input)
Receive
completed
notification
KCLK
(output)
KBTE
KTER
KBTS
KD
(pin state)
Parity
I/O inhibit
[1] to [3]
[6] [7] [8]
[9] [10]
[11]
[4]
[5]
Stop bit
I/O inhibit
Start bit
Figure 19.6 Transmit Timing
19.4.3 Receive
Abort
This LSI (system side) can forcibly abort transmission from the device connected to it (keyboard
side) in the event of a protocol error, etc. In this case, the system holds the clock low. During
reception, the keyboard also outputs a clock for synchronization, and the clock is monitored when
the keyboard output clock is high. If the clock is low at this time, the keyboard judges that there is
an abort request from the system, and data transmission from the keyboard is aborted. Thus the
system can abort reception by holding the clock low for a certain period. A sample receive abort
processing flowchart is shown in figure 19.7, and the receive abort timing in figure 19.8.
Содержание H8S/2100 Series
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