7477 datasheet(262/354 Pages) RENESAS

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2-27

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

APPLICATION

2.4 Serial I/O

7470

7471

7477

7478

Fig. 2.4.5 Example of control procedure (1) [Byte specification mode, 7470/7471 group]

××

oCgJE

M⁄P

œlO

Zbg

Transmit side (M3747x

Write the dummy data into the Serial I/O register

Clear the serial I/O interrupt enable bit

(Serial I/O interrupt disabled)

Set port P17 as an input

Write the transmit data to receive side 1

into the Serial I/O register

Set the serial I/O mode register

Internal clock

← f(XIN)/32

Synchronous clock

← Internal clock

Select SOUT, CLK

Select port P17

–

Mode

← Ordinary mode

CMOS output

00 01

Receive side 1 (M3747x

Connect a pull-up transistor to port P1

Set port P10 as an output

Set the serial I/O interrupt enable bit

(Serial I/O interrupt enabled)

Clear the serial I/O interrupt request bit

Transmit preparation signal port P1

← “L”

Transmit preparation signal port P1

← “H”

Port P17 = “H” ?

Write the transmit data to receive side 2

into the Serial I/O register

Write the transmit data to receive side 3

into the Serial I/O register

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

Transmit preparation

signal port P1 0

← “L” ?

Set the initial value of “0” of the receive side 1 in the byte counter

Set the Serial I/O mode register

SM (Address 00DC 16)

–

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

Serial I/O interrupt

SM (Address 00DC16)

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