M38B53M4-059FP datasheet(140/355 Pages) MITSUBISHI

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2-52

38B5 Group User’s Manual

APPLICATION

2.3 Serial I/O

Control procedure: When the registers are set as shown in Figure 2.3.22, the serial I/O1 can transmit

1-byte data by writing data to the serial I/O1 register.

Thus, after setting the CS signal to “L”, write the transmission data to the serial

I/O1 register by each 1 byte; and return the CS signal to “H” when the target

number of bytes has been transmitted.

Figure 2.3.24 shows a control procedure.

Fig. 2.3.24 Control procedure

Initialization

SC11 (address 001916)

SC12 (address 001A16)

SC13 (address 001C16)

P6 (address 000C16), bit2

P6D (address 000D16), bit2

SC11 (address 001916), bit4

001000012

00XX00002

011XXXXX2

P6 (address 000C16), bit2

SIO1CON2 (address 001A16), bit5 ?

RESET

SIO1 (address 001B16)

All data have been transmitted ?

P6 (address 000C16), bit2

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

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

Returning CS signal output level to “H” when

transmission of the target number of bytes is

completed

Serial I/O1 setting

CS signal output level to “H” setting

CS signal output port setting

Enabled serial I/O1

CS signal output level to “L” setting

Transmission data write

(Start of 1-byte data transmission)

Transmission data

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