7540 datasheet(192/366 Pages) RENESAS

192 / 366 page

2-116

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.6 Serial I/O1

Fig. 2.6.20 Control procedure of transmitter

10 ms elapsed ?

(generated by timer)

RESET

SEI

CLD

CLT

10 0

UARTCON(Address 1B16)

Character length: 8 bits

Parity disabled

Stop bit length: 2 bits

TXD: CMOS output

Set UART control register

0 1

“0716”

Set “0” to the communication control port P00.

SIO1CON(Address 1A16)

BRG count source: f(XIN)/4

Synchronous clock:

BRG output/16

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

UART

Serial I/O1 enabled

Set serial I/O1 control register

BRG(Address 1C16)

Set baud rate generator

Initialization

TB/RB(Address 1816)

Write the first-byte transmission data to

the transmit/receive buffer register

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))

Transmit buffer has emptied?

(checked by b0 of SIO1STS

(address 1916))

Set “1” to the communication control port P00.

Set the communication control port P00 to the

output mode.

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