M38047FEHKP datasheet(194/387 Pages) RENESAS

194 / 387 page

2-70

APPLICATION

2.4 Serial interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

When the registers are set as shown in Fig. 2.4.30, serial I/O2 can transmit 1-byte data by writing

data to the serial I/O2 register.

Thus, after setting the CS signal to “L”, write the transmission data to the serial I/O2 register by each

1 byte, and return the CS signal to “H” when the target number of bytes has been transmitted.

Figure 2.4.32 shows a control procedure of serial I/O2.

Fig. 2.4.32 Control procedure of serial I/O2

P6 (Address : 000C16), bit3

IREQ2 (Address : 003D16), bit2?

Complete to transmit data?

Initialization

SIO2CON

INTSEL

ICON2

P6D

(Address : 001D16)

(Address : 003916)

(Address : 003F16), bit2

(Address : 000C16), bit3

(Address : 000D16)

010010102

XXXXXX0X2

XXXX1XXX2

IREQ2 (Address : 003D16), bit2

SIO2 (Address : 001F16)

P6 (Address : 000C16), bit3

a transmission

data

• Returning CS signal output level to “H”

when transmission of the target number

of bytes is completed

• Serial I/O2 interrupt : Disabled

• CS signal output port setting

(“H” level output)

RESET

q X: This bit is not used here. Set it to “0” or “1” arbitrarily.

• Serial I/O2 control register setting

• CS signal output level to “L” setting

• Serial I/O2 interrupt request bit to “0” setting

• Transmission data write

(Start of transmit 1-byte data)

• Judgment of completion of transmitting 1-byte

data

• Use any of RAM area as a counter for counting

the number of transmitted bytes.

• Judgment of completion of transmitting the

target number of bytes

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