7477 datasheet(260/354 Pages) RENESAS

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

APPLICATION

2.4 Serial I/O

7470

7471

7477

7478

Fig. 2.4.3 Example of control procedure [Clock synchronous serial I/O mode, 7470/7471 group]

××

M3747x

Set the Serial I/O mode register

SM (Address 00DC 16)

–

Synchronous clock

← External clock

Select SOUT, CLK

SRDY signal output

Select SRDY signal

Mode

← Ordinary mode

CMOS output

Clear the serial I/O interrupt enable bit

(Serial I/O interrupt disabled)

Set port P14 to input

Set the serial I/O interrupt enable bit

(Serial I/O interrupt enabled)

Clear the serial I/O interrupt request bit

Write the transmit data into the Serial I/O register

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

0 !

00 11

Clear the serial I/O interrupt enable bit

(Serial I/O interrupt disabled)

Set port P17 to input

Set the serial I/O interrupt enable bit

(Serial I/O interrupt enabled)

Clear the serial I/O interrupt request bit

Port P17 = “L” ?

Write the transmit data into the Serial I/O register

Set the Serial I/O mode register

SM (Address 00DC16)

Internal clock

← f(XIN)/16

Synchronous clock

← Internal clock

Select SOUT, CLK

Select port P17

–

Mode

← Ordinary mode

CMOS output

01 0

0 ! 01

Serial I/O interrupt

7477 Datasheet(PDF) 260 Page - Renesas Technology Corp

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