3886 datasheet(175/380 Pages) RENESAS

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3886 Group User’s Manual

APPLICATION

2.4 Serial I/O

(2)

Output of serial data (control of peripheral IC)

Outline : 4-byte data is transmitted and received, using the clock synchronous serial I/O.

The CS signal is output to a peripheral IC through port P53.

The example for using Serial I/O1 and the example using for Serial I/O2 are shown. The specification

of these examples are the same.

Figure 2.4.24 shows a connection diagram, and Figure 2.4.25 shows a timing chart.

Fig. 2.4.24 Connection diagram

Specifications : • The Serial I/O is used (clock synchronous serial I/O is selected.)

• Synchronous clock frequency : 125 kHz (f(XIN) = 4 MHz is divided by 32)

• Transfer direction : LSB first

• The Serial I/O interrupt is not used.

• Port P53 is connected to the CS pin (“L” active) of the peripheral IC for transmission

control; the output level of port P53 is controlled by software.

Fig. 2.4.25 Timing chart

P53

SCLK1

TXD

Peripheral IC

3886 group

(1) Example for using Serial I/O1

DATA

CLK

DATA

P53

SCLK2

SOUT2

Peripheral IC

3886 group

(2) Example for using Serial I/O2

DATA

CLK

DATA

DO0

DO1

DO2

DO3

CLK

DATA

Note: When serial I/O2 is used, SOUT2 pin is in the high-impedance state

after the transfer is completed.

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