Renesas H8S/2111B - Manual (Page 392)

Rev. 1.00, 05/04, page 358 of 544
Read KBCRH
Transmit end state
(KCLK = high, KD = high)
Yes
Note: * To switch to reception after transmission, set KBE to 1 (KBBR receive enable) while KCLKI is low.
1
KCLKI = 0?
No
KDI = 0?
Read KBCRH
KCLK = 1?
Yes
Yes
No
No
Error handling
To receive operation or
transmit operation
Keyboard side in data
transmission state.
Execute receive abort
processing.
2
*
[7]
[8]
Figure 14.5 Sample Transmit Processing Flowchart (2)
1
0 1
0 1
7
7
2 8 9 10 11
KCLK
(pin state)
KD
(pin state)
KCLK
(output)
KD
(output)
KCLK
(input)
KD
(input)
Start bit
Start bit
Parity bit Stop bit
Parity bit Stop bit
I/O inhibit
Receive
completed
notification
[1] [2] [3] [4] [5] [6] [7] [8]
Figure 14.6 Transmit Timing