Kclk Fall Interrupt Operation - Renesas H8S/2100 Series Hardware Manual

16-bit single-chip microcomputer

Hide thumbs Also See for H8S/2100 Series:

Table of Contents

Section 19 Keyboard Buffer Control Unit (PS2)

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 19.14 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.

Figure 19.14 Example of KCLK Input Fall Interrupt Operation

Rev. 1.00 Apr. 28, 2008 Page 608 of 994

REJ09B0452-0100

H8s/2117r series R4f2117r