3819 datasheet(110/218 Pages) RENESAS

110 / 218 page

2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.3 Serial I/O

3819 Group USER’S MANUAL

Control procedure :When the registers are set as shown in Fig. 2.3.15, the Serial I/O 1 can transmit one-byte data

simply by writing data to the Serial I/O 1 register.

Thus, after setting the CS signal to “L”, write the transmission data to the Serial I/O 1 register

on a one-byte base, and return the CS signal to “H” when the desired number of bytes have

been transmitted.

Fig. 2.3.17 Control procedure [Output of serial data]

Set the Serial I/O 1.

Set the CS signal output level to “H.”

Set the CS signal output port.

Set the CS signal output level to “L.”

Set the Serial I/O 1 interrupt request bit to “0”.

Write a transmission data.

(start to transmit 1-byte data)

Check the completion of transmitting 1-byte

data.

Use any of RAM area as a counter for

counting the number of transmitted bytes.

Check that transmission of the target num-

ber of bytes has been completed.

Return the CS signal output level to “H” when

transmission of the target number of bytes is

completed.

RESET

P6 (Address:0C 16), bit7

IREQ1 (Address:3C 16), bit3?

Complete to transmit data?

Initialization

SIO1CON

SIOAC

P6D

(Address:19 16)

(Address:1A16)

(Address:0C16), bit7

(Address:0D16), bit7

010010102

000000002

IREQ1 (Address:3C 16), bit3

SIO1 (Address:1B 16)

P6 (Address:0C16), bit7

a transmission

data

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