38K2 datasheet(203/358 Pages) RENESAS

203 / 358 page

2.4 Serial I/O

Rev.2.00

Oct 15, 2006

page 54 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

Figure 2.4.21 shows registers setting related to Serial I/O, and Figure 2.4.22 shows a setting of serial

I/O transmission data.

Fig. 2.4.22 Setting of serial I/O transmission data

Fig. 2.4.21 Registers setting related to Serial I/O

SRDY

output enable bit : SRDY output disabled

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

Serial I/O transmit interrupt enable bit : Interrupt disabled

ICON2

Interrupt control register 2 (Address : 3F16)

Serial I/O transmit interrupt request bit

Confirm completion of transmitting

1-byte data by one unit.

“1” : Transmit shift completion

IREQ2

Interrupt request register 2 (Address : 3D16)

SIOCON

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

BRG count source selection bit : f(XIN)

Transmit interrupt source selection bit : Transmit shift operating

completion

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

Set “division ratio – 1”.

BRG

Baud rate generator (Address : 0FE216)

Set a transmission data.

Confirm that transmission of the previous data is

completed (bit 3 of the Interrupt request register 2

is “1”) before writing data.

TB/RB

Transmit/Receive buffer register (Address : 2616)

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