h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 556

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 17 Keyboard Buffer Controller
Rev. 3.00 Mar 21, 2006 page 502 of 788
REJ09B0300-0300
KCLK
(pin state)
KD
(pin state)
KCLK
(input)
KCLK
(output)
KD
(input)
KD
(output)
Receive data processing
Receive operation ends
Transmit enabled state.
If there is transmit data,
the data is transmitted.
Clear KBF flag
(KCLK = High)
Reception in progress
Processing 1
normally
Figure 17.7 (2) Sample Receive Abort Processing Flowchart
Figure 17.8 Receive Abort and Transmit Start
(Transmission/Reception Switchover) Timing
Keyboard side monitors clock during
receive operation (transmit operation
as seen from keyboard), and aborts
receive operation during this period.
[1]
Receive abort request
[1] On the system side, drive the KCLK pin low,
setting the I/O inhibit state.
Transmit operation
Start bit