M38K09RFS datasheet(178/328 Pages) RENESAS

tên linh kiện	M38K09RFS

Giải thích chi tiết về linh kiện	RENESAS 8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

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2.4 Serial I/O

Rev.2.00

Oct 05, 2006

page 49 of 111

38K0 Group

REJ09B0337-0200

APPLICATION

Fig. 2.4.15 Registers setting related to transmitting side

Serial I/O status register (Address : 2716)

SIOSTS

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 : 0FF316)

INTEDGE

INT1 interrupt edge selection bit : Falling edge active

Baud rate generator (Address : 0FE216)

BRG

Set “division ratio – 1”.

Serial I/O control register (Address : 0FE016)

SIOCON

BRG counter source selection bit : f(XIN)

Serial I/O synchronous clock selection bit : BRG/4

Transmit enable bit : Transmit enabled

Receive enable bit : Receive disabled

Serial I/O mode selection bit : Clock synchronous serial I/O

Serial I/O enable bit : Serial I/O enabled

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