M38041F2HKP datasheet(196/387 Pages) RENESAS

196 / 387 page

2-72

APPLICATION

2.4 Serial interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

The communication is performed according to the timing shown in Figure 2.4.34. In the slave unit,

when a synchronous clock is not input within a certain time (heading adjustment time), the next clock

input is processed as the beginning (heading) of a block.

When a clock is input again after one block (8 byte) is received, the clock is ignored.

Figure 2.4.35 shows relevant registers setting.

Fig. 2.4.34 Timing chart

Fig. 2.4.35 Relevant registers setting

Byte cycle

Block transfer term

Block transfer cycle

Interval between blocks

Processing for heading adjustment

Heading adjustment time

Master unit

Transmit enabled

SIO1CON

Serial I/O1 control register (Address : 001A16)

Synchronous clock : BRG/4

Transmit interrupt source :

Transmit shift operating completion

Receive enabled

Clock synchronous serial I/O

Serial I/O1 enabled

BRG count source : f(XIN)

SRDY1

output disabled

Not be affected by external clock

Transmit enabled

SIO1CON

Serial I/O1 control register (Address : 001A16)

Not use the serial I/O1 transmit interrupt

Receive enabled

Clock synchronous serial I/O

Slave unit

Serial I/O1 enabled

Synchronous clock : External clock

UART1CON

UART1 control register (Address : 001B16)

P45/TXD1 pin : CMOS output

Both of units

8 – 1

BRG1

Baud rate generator 1 (Address : 001C16)

Set “division ratio – 1”

SRDY1

output disabled

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