7540 datasheet(202/366 Pages) RENESAS

202 / 366 page

2-126

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.7 Serial I/O2

Fig. 2.7.11 Control procedure of transmission side

0 11

RESET

INT0 falling edge active

SIO2(Address 3116)

Set port P12 to the output mode.

Set “0” to the serial I/O2 interrupt request bit.

SIO2CON(Address 3016)

Synchronous clock: f(XIN)/64

SDATA2 pin: SDATA2 output

LSB first

SCLK2 pin: Internal clock

Set serial I/O2 control register

INT0 falling edge input?

Initialization

SEI

CLD

CLT

INTEDGE(Address 3A16)

Set INT0 interrupt active edge

Write the first-byte transmission data to

the serial I/O2 register

Transmit shift has completed?

(checked by serial I/O2 interrupt

request bit)

Set port P13 to the output mode. (Note)

SIO2(Address 3116)

Set “0” to the serial I/O2 interrupt request bit.

Write the second-byte transmission data to

the serial I/O2 register

Transmit shift has completed?

(checked by serial I/O2 interrupt

request bit)

Note: When direction register of P13/SDATA2 pin is set to the input mode and

the internal clock is selected, the SDATA2 pin is in a high impedance

state after the data transfer is completed.

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