7540 datasheet(186/366 Pages) RENESAS

186 / 366 page

2-110

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.6 Serial I/O1

Fig. 2.6.14 Control procedure of transmitter

SIO1CON(Address 1A16)

BRG count source: f(XIN)

Synchronous clock:

BRG output/4

P13 pin (Normal I/O pin)

Transmit interrupt source:

W h e n tra n sm it b u ffe r h a s e m p tie d

Transmit enabled

Receive disabled

Clock synchronous serial I/O

Serial I/O1 enabled

Set serial I/O1 control register

0 00

BRG(Address 1C16)

Set baud rate generator

INT0 falling edge input?

Initialization

RESET

SEI

CLD

CLT

11 00

“0716”

INTEDGE(Address 3A16)

INT0 falling edge active

Set INT0 interrupt active edge

TB/RB(Address 1816)

Write the first-byte transmission data to

the transmit/receive buffer register

Transmit buffer has emptied?

(checked by b0 of SIO1STS

(address 1916))

TB/RB(Address 1816)

Write the second-byte transmission data to

the transmit/receive buffer register

Transmit buffer has emptied?

(checked by b0 of SIO1STS

(address 1916))

Transmit shift has completed?

(checked by b2 of SIO1STS

(address 1916))

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