HD64F2149YV datasheet(607/1075 Pages) RENESAS

Nome de Peças	HD64F2149YV

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1075 Pages

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Fabricante Electrônico	RENESAS [Renesas Technology Corp]

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Section 17 Keyboard Buffer Controller

Rev. 3.00 Jan 18, 2006 page 579 of 1044

REJ09B0280-0300

17.3.8

KCLK Fall Interrupt Operation

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 17.13 shows the setting method and an example of operation.

Start

Set KBIOE

KBF = 1

(interrupt generated)

KBE = 0

(KBBR reception

disabled)

Interrupt handling

Clear KBF

KCLK pin

fall detected?

KBFSEL = 0

KBIE = 1

(KCLK falling edge

interrupts enabled)

Yes

KCLK

(pin state)

KBF bit

Interrupt

generated

Interrupt

generated

Cleared

by software

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 17.13 Example of KCLK Input Fall Interrupt Operation

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