beautypg.com

FUJITSU MB91460 SERIES FR60 User Manual

Page 671

background image

655

Chapter 32 USART (LIN / FIFO)

7.USART Operation

7.5 Bidirectional Communication Function (Normal Mode)

In operation mode 0 or 2, normal serial bidirectional communication is available. Select operation mode 0 for
asynchronous communication and operation mode 2 for synchronous communication.

Bidirectional Communication Function

The settings shown in figure

7-8

are required to operate USART in normal mode (operation mode 0 or 2).

Figure 7-8 Settings for USART operation mode 0 and 2

Inter-CPU Connection

As shown in figure

7-9

, interconnect two CPUs in USART mode 2

Figure 7-9 Connection example of USART mode 2 bidirectional communication

7.6 Master-Slave Communication Function (Multiprocessor Mode)

USART communication with multiple CPUs connected in master-slave mode is available for both master or
slave systems.

bit

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

SCR04,

SMR0

4

PEN

P

SBL

CL

AD

CRE RXE

TXE MD1 MD0 OTO EXT

REST UPCL SCKE SOE

Mode 0

x

0

0

0

x

0

0

0

Mode 2

x

x

0

1

0

0

0

SSR04,
TDR04/RDR04

PE ORE FRE RDRF TDRE BDS RIE

TIE

Set transmission data (during writing)

Retain reception data (during reading)

Mode 0

Mode 2

ESCR04,ECCR
04

LBIE LBD LBL1 LBL0 SOPE SIOP CCO SECS

-

LBR MS SCDE SSM

BIE

RBI

TBI

Mode 0

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

Mode 2

x

x

x

x

x

x

x

x

x

x

Bit is used

x Bit is not used

0 / 1 Set bit to 0 / 1

Bit is used if SSM = 1 (Synchronous start-/stop-bit mode)

SOT

SIN

SCK

SOT

SIN

SCK

CPU-1 (Master)

CPU-2 (Slave)

Output

Input