7540 datasheet(184/366 Pages) RENESAS

184 / 366 page

2-108

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.6 Serial I/O1

Fig. 2.6.11 Setting method for clock synchronous serial I/O1 (2)

Process 7: Transmit/Receive of serial data (Notes 1, 2).

Transmit/Receive buffer register (TB/RB) [Address 1816]

b7b0

Set transmit data (in full-duplex communication)

Set dummy data (in half-duplex communication)

Process 5: In order not to execute the no requested interrupt processing, set “0” (no requested)

to the serial I/O1 transmit/receive interrupt request bit.

Interrupt request register 1 (IREQ1) [Address 3C16]

No serial I/O1 receive interrupt request issued

No serial I/O1 transmit interrupt request issued

Serial I/O1 receive interrupt enabled

Serial I/O1 transmit interrupt enabled

Interrupt control register 1 (ICON1) [Address 3E16]

Process 6: When the interrupt is used, set “1” (interrupt enabled) to the serial I/O transmit/receive

interrupt enable bit.

Notes 1: When data transmission is executed at the state that an external clock input is

selected as the synchronous clock, set the transmit data while the SCLK is “H” state.

2: When inputting the SRDY1 signal, set used pins to to the input mode before

transmitting data.

7540 Datasheet(PDF) 184 Page - Renesas Technology Corp