Kclk Fall Interrupt Operation; Figure 17.14 Example Of Kclk Input Fall Interrupt Operation - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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KCLK Fall Interrupt Operation

In this device, clearing the KBFSEL bit to 0 in KBCRH enables the KBF bit in KBCRH to be

used as a flag for the interrupt generated by the fall of KCLK input.

Figure 17.14 shows the setting method and an example of operation.

(KBBR reception

(KCLK falling edge

interrupts enabled)

fall detected?

(interrupt generated)

Interrupt handling

Note:* The KBF setting timing is the same as the timing of KBF setting and KCLK automatic I/O inhibit bit

generation in figure 17.11. When the KBF bit is used as the KCLK input fall interrupt flag, the

automatic I/O inhibit function does not operate.

Section 17 Keyboard Buffer Control Unit (KBU)

Rev. 3.00 Jul. 14, 2005 Page 605 of 986

REJ09B0098-0300

H8s/2100 series H8s/2114r R4f2114r