3819 datasheet(116/218 Pages) RENESAS

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102

2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.3 Serial I/O

3819 Group USER’S MANUAL

The communication is performed according to the timing shown below. In the slave unit, when a synchronizing clock

is not input within a certain time (heading adjustive 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 2.3.25 shows a setting of related registers.

Fig. 2.3.24 Timing chart [Cyclic transmission or reception of block data between microcomputers]

Fig. 2.3.25 Setting of related registers [Cyclic transmission or reception of block data between microcomputers]

Byte cycle

Block transmission period

Block transmission cycle

Interval between blocks

Processing for heading adjustment

Heading adjustive time

Not be effected by

external clock

Not use the SRDY1 signal

output function

SIO1CON

Serial I/O 1 control register (Address:1916)

Internal synchronous

clock : f(XIN)/32

Use the Serial I/O 1

Not use the SRDY1 signal

output function

LSB first

Internal clock

110

SIO1CON

Serial I/O 1 control register (Address:1916)

Use the Serial I/O 1

LSB first

External clock

Master unit

Slave unit

SIOAC

Serial I/O automatic transfer control register (Address:1A16)

Serial I/O ordinary mode

When an automatic transfer function

is not used, the S CLK11 is used as an

I/O pin for a synchronizing clock (the

SCLK12 is not selected).

Note :

[When using the Serial I/O 1]

CMOS output

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