7477 datasheet(266/354 Pages) RENESAS

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2-31

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

APPLICATION

2.4 Serial I/O

7470

7471

7477

7478

Fig. 2.4.9 Example of control procedure [Clock synchronous serial I/O mode, 7477/7478 group]

××

Write the transmit data into the Transmit buffer register

(Write the dummy data in the half-duplex communication)

M3747x

Serial I/O transmit interrupt

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

Set baud rate generator

Set the Serial I/O control register

Select BRG count source

Synchronous clock

← External clock

SRDY output enabled

Select transmit interrupt source

Transmit enabled

Receive enabled

Clock synchronous serial I/O selected

Serial I/O enabled

11 1 !

Serial I/O receive interrupt

NOP

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 disable)

Clear the serial I/O receive interrupt enable bit

(Serial I/O receive interrupt disable)

Set port P17 as an input

NOP

Set the serial I/O transmit interrupt enable bit

(Serial I/O transmit interrupt enable)

Set the serial I/O receive interrupt enable bit

(Serial I/O receive interrupt enable)

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

Port P17 = “L” ?

Set the Serial I/O control register

Select BRG count source

Synchronous clock

← BRG output divided by 4

SRDY output disabled

Select transmit interrupt source

Transmit enabled

Receive enabled

Clock synchronous serial I/O selected

Serial I/O enabled

10 0

11 1 !! SIOCON (Address 00E2 16)

SIOCON (Address 00E2 16)

Serial I/O receive interrupt

Serial I/O transmit interrupt

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