M38005M2DXXXFP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38005M2DXXXFP

8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI ELECTRIC  

APPLICATION

2.3 Serial I/O

Control procedure : Figure 2.3.17 shows a control procedure at a transmitting side, and Figure

2.3.18 shows a control procedure at a receiving side.

RESET

q X : This bit is not used in this application.

Set it to “0” or “1.” It’s value can be disregarded.

Initialization

SIOCON (Address : 1A16) 1101XX002

BRG

(Address : 1C16)

8–1

INTEDGE (Address : 3A16), bit0 0

0

IREQ1 (Address : 3C16), bit0?

1

IREQ1 (Address : 3C16), bit0 0

q Detect INT0 falling edge

TB/RB (Address : 1816)

The first byte of a

transmission data

q Write a transmission data

The Transmit buffer empty flag is set to “0”

by this writing.

SIOSTS (Address : 1916), bit0?

0

1

TB/RB (Address : 1816)

The second byte of a

transmission data

q Check to be transfered data from the Transmit

buffer register to the Transmit shift register.

(Transmit buffer empty flag)

qWrite a transmission data

The Transmit buffer empty flag is set to “0”

by this writing.

0

SIOSTS (Address : 1916), bit0?

1

q Check to be transfered data from the Transmit

buffer register to the Transmit shift register.

(Transmit buffer empty flag)

SIOSTS (Address : 1916), bit2?

0

q Check a shift completion of the Transmit shift register

(Transmit shift register shift completion flag)

1

Fig. 2.3.17 Control procedure at a transmitting side [Communication using a clock synchronous

serial I/O]

2-34

3800 GROUP USER’S MANUAL

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