38K2 datasheet(204/358 Pages) RENESAS

204 / 358 page

2.4 Serial I/O

Rev.2.00

Oct 15, 2006

page 55 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

When the registers are set as shown in Fig. 2.4.21, the Serial I/O 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 2.4.23 shows a control procedure of Serial I/O.

Fig. 2.4.23 Control procedure of Serial I/O

P5 (Address : 0A16), bit3

← 0

IREQ2 (Address : 3D16), bit3?

Complete to transmit data?

Initialization

SIOCON

(Address : 0FE016)

← 110110002

UARTCON (Address : 0FE116), bit4

← 0

BRG

(Address : 0FE216)

← 12–1

ICON2

(Address : 3F16), bit3

← 0

(Address : 0A16), bit3

← 1

P5D

(Address : 0B16)

← xxxx1xxx2

IREQ2 (Address : 3D16), bit3

← 0

TB/RB (Address : 2616)

P5 (Address : 0A16), bit3

← 1

a transmission

data

•Return the CS signal output level to “H”

when transmission of the target number

of bytes is completed

•Serial I/O transmit interrupt : Disabled

•CS signal output port set

(“H” level output)

RESET

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

•Serial I/O set

•CS signal output level to “L” set

•Serial I/O transmit interrupt

request bit set to “0”

•

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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