Renesas H8S Series Hardware Manual page 634

Section 17 Keyboard Buffer Control Unit (KBU)
Bit Bit Name Initial Value
4 KTIE 0

3 0
2 KCIF 0
1 KBTE 0
0 KTER 0
Note: Only 0 can be written for clearing the flag.
*
Rev. 3.00 Jul. 14, 2005 Page 586 of 986
REJ09B0098-0300
R/W Description
R/W Transmit Completion Interrupt Enable
Selects whether a transmit completion interrupt is
enabled or disabled.
0: Disables transmit completion interrupt
1: Enables transmit completion interrupt

Reserved
The initial value should not be changed.
R/(W)* First KCLK Falling Interrupt Flag
Indicates that the first falling edge of KCLK is detected.
When KCIE and KCIF are set to 1, requests the CPU
an interrupt.
0: [Clearing condition]
•
After reading KCIF = 1, 0 is written
1: [Setting condition]
•
When the first falling edge of KCLK is detected
Note that this flag cannot be set when software standby
mode, watch mode, or subsleep mode is cancelled.
(However, internal flag is set.)
R/(W)* Transmit Completion Flag
Indicates that data transmission is completed. When
KTIE and KBTE are set to 1, requests the CPU an
interrupt.
0: [Clearing condition]
•
After reading KBTE = 1, 0 is written
1: [Setting Condition]
•
When all KBTR data has been transmitted (Set at
the eleventh rising edge of the KCLK signal)
R Transmit Error
Stores a notification of receive completion. Valid only
when KBTE = 1.
0: 0 received as a notification of receive completion.
1: 1 received as a notification of receive completion.