HD64F2149YV datasheet(601/1075 Pages) RENESAS

601 / 1075 page

Section 17 Keyboard Buffer Controller

Rev. 3.00 Jan 18, 2006 page 573 of 1044

REJ09B0280-0300

Read KBCRL

KBF = 0?

RXCR3 to RXCR0

≥

B'1001?

Disable receive abort

requests

Yes

Start

Receive state

Read KBCRH

Processing 1

KCLKO = 0

(receive abort request)

Retransmit

command transmission

(data)?

KBE = 0

(disable KBBR reception

and clear receive counter)

Set start bit

(KDO = 0)

Clear I/O inhibit

(KCLKO = 1)

Transmit data

To transmit operation

KBE = 0

(disable KBBR reception

and clear receive counter)

KBE = 1

(enable KB operation)

Clear I/O inhibit

(KCLKO = 1)

To receive operation

[1] Read KBCRL, and if KBF = 1,

perform processing 1.

[2] Read KBCRH, and if the value of

bits RXCR3 to RXCR0 is less than

B'1001, write 0 in KCLKO to abort

reception.

If the value of bits RXCR3 to

RXCR0 is B'1001 or greater, wait

until stop bit reception is

completed, then perform receive

data processing, and proceed to

the next operation.

[3] If the value of bits RXCR3 to

RXCR0 is B'1001 or greater, the

parity bit is being received. With

the PS2 interface, a receive abort

request following parity bit

reception is disabled. Wait until

stop bit reception is completed,

perform receive data processing

and clear the KBF flag, then

proceed to the next operation.

Yes

[1]

[2]

[3]

Figure 17.7 Sample Receive Abort Processing Flowchart

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