7477 datasheet(263/354 Pages) RENESAS

263 / 354 page

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

2-28

APPLICATION

2.4 Serial I/O

7470

7471

7477

7478

Fig. 2.4.6 Example of control procedure (2) [Byte specification mode, 7470/7471 group]

××

oCgJE

M⁄P

œlO

Zbg

oCgJE

M⁄P

œlO

Zbg

Write the dummy data into the Serial I/O register

Receive side 2 (M3747x

Clear the serial I/O interrupt enable bit

(Serial I/O interrupt disabled)

Set port P14 as an input

Set port P10 as an input

Set the serial I/O interrupt enable bit

(Serial I/O interrupt enabled)

Clear the serial I/O interrupt request bit

Set the initial value of “1” of the receive side 2 in the Byte counter

Set the Serial I/O mode register

SM (Address 00DC16)

–

Synchronous clock

← External clock

Select SOUT, CLK

Select SRDY signal output pin

Select SARDY signal

Mode

← Byte specify mode

N-channel open-drain output

111 1

Write the dummy data into the Serial I/O register

Set the initial value of “2” of the receive side 3 in the Byte counter

Transmit preparation

signal port P10

← “L” ?

Set the serial I/O interrupt enable bit

(Serial I/O interrupt enabled)

Clear the serial I/O interrupt request bit

Clear the serial I/O interrupt enable bit

(Serial I/O interrupt disabled)

Set port P14 as an input

Set port P10 as an input

Set the Serial I/O mode register

SM (Address 00DC16)

–

Synchronous clock

← External clock

Select SOUT, CLK

Select SRDY signal output pin.

Select SARDY signal

Mode

← Byte specify mode

N-channel open-drain output

11 11

Receive side 3 (M3747x

Serial I/O interrupt

Transmit preparation

signal port P10

← “L” ?

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