H8S2110B RENESAS [Renesas Technology Corp], H8S2110B Datasheet - Page 393

• Manufacturer Part Number: H8S2110B
• Description: Renesas 16-Bit Single-Chip Microcomputer Renesas H8S Family/H8S/2100 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

14.4.8
In this device, clearing the KBFSEL bit to 0 in KBCRH enables the KBF bit in KBCRL to be used
as a flag for the interrupt generated by the fall of KCLK input.
Figure 14.13 shows the setting method and an example of operation.
Note:* The KBF setting timing is the same as the timing of KBF setting and KCLK automatic I/O inhibit bit
(interrupt generated)
generation in figure 14.11. When the KBF bit is used as the KCLK input fall interrupt flag, the
automatic I/O inhibit function does not operate.
interrupts enabled)
(KCLK falling edge
Interrupt handling
(KBBR reception
KCLK Fall Interrupt Operation
fall detected?
KBFSEL = 0
Set KBIOE
Clear KBF
KCLK pin
disabled)
KBIE = 1
KBE = 0
KBF = 1
Start
Figure 14.13 Example of KCLK Input Fall Interrupt Operation
Yes
No
KCLK
(pin state)
KBF bit
Interrupt
generated
Rev. 2.00 Mar 21, 2006 page 355 of 518
Section 14 Keyboard Buffer Controller
Cleared
by software
REJ09B0299-0200
Interrupt
generated