M38045FEHKP datasheet(186/387 Pages) RENESAS

186 / 387 page

2-62

APPLICATION

2.4 Serial interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

Fig. 2.4.21 Registers setting relevant to transmitting side

Serial I/O1 status register (Address : 001916)

SIO1STS

Transmit buffer empty flag

• Confirm that the data has been transferred from Transmit buffer

• When this flag is “1”, it is possible to write the next transmission

data in to Transmit buffer register.

Transmitting side

Transmit shift register shift completion flag

Confirm completion of transmitting 1-byte data with this flag.

“1” : Transmit shift completed

Interrupt edge selection register (Address : 003A16)

INTEDGE

INT1 falling edge active

Baud rate generator 1 (Address : 001C16)

BRG1

Set “division ratio – 1”

8 – 1

Serial I/O1 control register (Address : 001A16)

SIO1CON

BRG count source : f(XIN)

Serial I/O1 synchronous clock : BRG/4

Transmit enabled

Receive disabled

Clock synchronous serial I/O

Serial I/O1 enabled

Port P4 direction register (Address : 000916)

P4D

Port P42/INT1: Input mode

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