M38047FEHKP datasheet(192/387 Pages) RENESAS

192 / 387 page

2-68

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. 2.4.27, serial I/O1 can transmit 1-byte data by writing

data to the transmit buffer register.

Thus, after setting the CS signal to “L”, write the transmission data to the transmit buffer register by

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

Figure 2.4.29 shows a control procedure of serial I/O1.

Fig. 2.4.29 Control procedure of serial I/O1

P6 (Address : 000C16), bit3

IREQ1 (Address : 003C16), bit3?

Complete to transmit data?

Initialization

SIO1CON

UART1CON

BRG1

ICON1

P6D

(Address : 001A16)

(Address : 001B16), bit4

(Address : 001C16)

(Address : 003E16), bit3

(Address : 000C16), bit3

(Address : 000D16)

110110002

XXXX1XXX2

IREQ1 (Address : 003C16), bit3

TB1/RB1 (Address : 001816)

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/O1 transmit interrupt : Disabled

• CS signal output port setting

(“H” level output)

RESET

8–1

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

• Serial I/O1 setting

• CS signal output level to “L” setting

• Serial I/O1 transmit 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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