3819 datasheet(112/218 Pages) RENESAS

112 / 218 page

2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.3 Serial I/O

3819 Group USER’S MANUAL

Fig. 2.3.20 Setting of related registers [Data transmission or reception using automatic transfer]

Automatic transfer mode

SIOAC

Serial I/O automatic transfer control register (Address:1A 16)

Fullduplex (transmit/receive) mode

Synchronous clock output pin : S CLK11

Set to a transfer completion state (stop

transferring) in initialization.

(After setting a transmission data, set to

“1” at starting automatic transfer.)

Set “the number of transfer bytes – 1”

(in this example, (8 bytes – 1) = 7 is set after

completing to transfer 1-byte data, and

before starting to transfer the next data.)

SIODP

Serial I/O automatic transfer data pointer (Address:1816)

011 1

Serial I/O automatic transfer interrupt : Disabled

ICON1

Interrupt control register 1 (Address:3E16)

Set an interval of transfer clock,32 bits.

(set so that “setting value + 2 = 32.”)

SIOAI

Serial I/O automatic transfer interval register (Address:1C16)

11 0

SIO1CON

Serial I/O1 control register (Address:1916)

Internal synchronous clock : f(X IN)/32

Use Serial I/O 1

Not use SRDY1 signal output function

LSB first

Internal clock

CMOS output

3819 Datasheet(PDF) 112 Page - Renesas Technology Corp