M38B53M4-059FP datasheet(153/355 Pages) MITSUBISHI

153 / 355 page

38B5 Group User’s Manual

APPLICATION

2-65

2.3 Serial I/O

Figure 2.3.41 shows the relevant registers setting and Figure 2.3.42 shows the setting of transmission

data.

BRG

ICON2

IREQ2

Interrupt request register 2 (address 003D16)

SIO2CON

1 1 0 1 1 0 0 0

UARTCON

Serial I/O2 control register (address 001D16)

BRG count source: f(XIN)

Synchronous clock: BRG/4

SRDY2 output not used

Transmit interrupt source: When transmit shift operation is completed

Transmit enabled

Receive disabled

Clock synchronous serial I/O

Serial I/O2 enabled

UART control register (address 001716)

P55/TxD pin: CMOS output

BRG clock: f(XIN)

Serial I/O2 clock: SCLK21

0716

Baud rate generator (address 001616)

Set “division ratio – 1”

Interrupt control register 2 (address 003F16)

INT3/Serial I/O2 transmit interrupt: Disabled

INT3/serial I/O2 transmit interrupt request cleared

Confirm transmission completion of 1-byte unit.

TB/RB

Serial I/O2 transmit/receive buffer register (001F16)

Set a transmission data.

Confirm that transmission of the previous data is

completed, where bit 4, the INT3/serial I/O2

transmit interrupt request bit of the interrupt

request register 2, is “1”; before writing data.

Fig. 2.3.41 Relevant registers setting

Fig. 2.3.42 Setting of transmission data

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