7477 datasheet(268/354 Pages) RENESAS

268 / 354 page

2-33

7470/7471/7477/7478 GROUP USER’S MANUAL

APPLICATION

2.4 Serial I/O

7470

7471

7477

7478

Fig. 2.4.11 Example of control procedure [Clock asynchronous serial I/O mode, 7477/7478 group]

××

Write the transmit data to the Transmit buffer register

in the full-duplex communication

Serial I/O transmit interrupt

Set the Serial I/O control register

BRG count source

← f(XIN)/4

Synchronous clock

← BRG output divided by 16

–

Select transmit interrupt source

Transmit enabled

Receive enabled

Clock asynchronous serial I/O selected

Serial I/O enabled

! 0

01 1 !

Serial I/O receive interrupt

Clear the serial I/O transmit interrupt enable bit

(Serial I/O transmit interrupt disabled)

Clear the serial I/O receive interrupt enable bit

(Serial I/O receive interrupt disabled)

M3747x

Clear the serial I/O transmit interrupt enable bit

(Serial I/O transmit interrupt disabled)

Clear the serial I/O receive interrupt enable bit

(Serial I/O receive interrupt disabled)

NOP

Set the serial I/O transmit interrupt enable bit

(Serial I/O transmit interrupt enabled)

Set the serial I/O receive interrupt enable bit

(Serial I/O receive interrupt enabled)

Clear the serial I/O transmit interrupt request bit

Clear the serial I/O receive interrupt request bit

Write the transmit data into the Transmit buffer register

Set the Serial I/O control register

BRG count source

← f(XIN)/4

Synchronous clock

← BRG output divided by 16

–

Select transmit interrupt source

Transmit enabled

Receive enabled

Clock asynchronous serial I/O selected

Serial I/O enabled

! 0

011 !

M3747x

Serial I/O transmit interrupt

Set baud rate generator

(Set “!!16” to BRG)

Set baud rate generator

(Set “!!16” to BRG)

NOP

Clear the serial I/O transmit interrupt request bit

Clear the serial I/O receive interrupt request bit

Set the serial I/O transmit interrupt enable bit

(Serial I/O transmit interrupt enabled)

Set the serial I/O receive interrupt enable bit

(Serial I/O receive interrupt enabled)

SIOCON (Address 00E2 16)

Serial I/O receive interrupt

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