h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 601

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Disable receive abort
RXCR3 to RXCR0
Read KBCRH
Receive state
Read KBCRL
KBF = 0?
requests
B'1001?
Start
Yes
Yes
Figure 17.7 Sample Receive Abort Processing Flowchart
[3]
No
No
and clear receive counter)
(disable KBBR reception
(receive abort request)
command transmission
To transmit operation
Clear I/O inhibit
Transmit data
(KCLKO = 1)
Processing 1
KCLKO = 0
Set start bit
(KDO = 0)
Retransmit
KBE = 0
(data)?
Yes
[1]
Rev. 3.00 Jan 18, 2006 page 573 of 1044
[2]
Section 17 Keyboard Buffer Controller
No
[1] Read KBCRL, and if KBF = 1,
[2] Read KBCRH, and if the value of
[3] If the value of bits RXCR3 to
perform processing 1.
bits RXCR3 to RXCR0 is less than
B'1001, write 0 in KCLKO to abort
reception.
If the value of bits RXCR3 to
RXCR0 is B'1001 or greater, wait
until stop bit reception is
completed, then perform receive
data processing, and proceed to
the next operation.
RXCR0 is B'1001 or greater, the
parity bit is being received. With
the PS2 interface, a receive abort
request following parity bit
reception is disabled. Wait until
stop bit reception is completed,
perform receive data processing
and clear the KBF flag, then
proceed to the next operation.
and clear receive counter)
(disable KBBR reception
(enable KB operation)
To receive operation
Clear I/O inhibit
(KCLKO = 1)
KBE = 0
KBE = 1
REJ09B0280-0300