M38005M2DXXXFP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38005M2DXXXFP

8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI ELECTRIC  

APPLICATION

2.3 Serial I/O

2.3.5 Serial I/O application examples

(1) Communication using a clock synchronous serial I/O (transmit/receive)

Outline : 2-byte data is transmitted and received through the clock synchronous serial I/O. The SRDY

signal is used for communication control.

Figure 2.3.13 shows a connection diagram, and Figure 2.3.14 shows a timing chart.

Transmitting side

Receiving side

P42/INT0

SCLK1

TXD

3800 group

SRDY

SCLK

RXD

3800 group

Fig. 2.3.13 Connection diagram [Communication using a clock synchronous serial I/O]

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)

• The SRDY (receivable signal) is used.

• The receiving side outputs the SRDY signal at intervals of 2 ms (generated by

timer), and 2-byte data is transferred from the transmitting side to the receiving

side.

SRDY

SCLK

TXD

D0 D1 D2 D3 D4 D5 D6 D7

D0 D1 D2 D3 D4 D5 D6 D7

2 ms

••••

••••

D0 D1 • • • •

Fig. 2.3.14 Timing chart [Communication using a clock synchronous serial I/O]

3800 GROUP USER’S MANUAL

2-31

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