beautypg.com

Figure 7-12 master-slave communication flowchart – FUJITSU MB91460 SERIES FR60 User Manual

Page 674

background image

658

Chapter 32 USART (LIN / FIFO)

7.USART Operation

Figure 7-12 Master-slave communication flowchart

Start

Set operation mode 1

Set SIN pin as the
serial data input pin.
Set SOT pin as the
serial data output pin.

Set 7 or 8 data bits.
Set 1 or 2 stop bits.

Set “1” in AD bit

Set TXE = RXE = 1.

Send Slave Address

Set “0” in AD bit.

Communicate with

slave CPU

Is

communication

complete?

Communicate

with another

slave CPU?

Set TXE = RXE = 0.

End

NO

YES

NO

YES

(Master CPU)

Start

Set operation mode 1

Set SIN pin as the
serial data input pin.
Set SOT pin as the
serial data output pin.

Set 7 or 8 data bits.
Set 1 or 2 stop bits.

(Slave CPU)

Set TXE = RXE = 1.

Receive Byte

Is

AD bit = 1 ?

Does

Slave Address

match?

Communicate with

master CPU

Is

communication

complete?

NO

NO

NO

YES

YES

YES