7480 datasheet(241/337 Pages) RENESAS

241 / 337 page

7480 Group and 7481 Group User's Manual

2-26

APPLICATIONS

2.3 Serial I/O

Figure 2.3.12 Communication Timing Example

Receive

processing

completed

Unit B

TxD pin output

Unit A

TxD pin output

Unit C

TxD pin output

SOF

Target ID

Source ID

transmit data

CRC code

EOD

RSP code

EOF

IFS

EOD

RSP code

EOF

IFS

EOD

RSP code

EOF

IFS

Source ID

transmit data

CRC code

Target ID

LAN

communication line

(RxD pin input)

Writing ‘0011110016’ to

transmit buffer register

for SOF transmission

• When unit A, unit B, and unit C start transmitting simultaneously

Transmit

processing

completed

Communication

completed

Writing ‘0011110016’ to

transmit buffer register

for SOF transmission

Writing ‘0011110016’ to

transmit buffer register

for SOF transmission

Successive writing dummy

data ‘0016’ to transmit buffer

ID to CRC code

Receive processing completed

after recognizing that target ID

is not source ID of unit A.

When the correct reception is

checked by CRC code, writing

RSP code to transmit buffer register

is performed.

Successive writing dummy

data ‘0016’ to transmit buffer

ID to CRC code after

recognizing that target ID is

source ID of unit B.

Units other than units A, B and C

start receive processing at the

rising edge of CNTR0 pin

Units other than units A, B and C

write successively dummy data ‘0016’

to transmit buffer register

for reception of priority code to CRC code

Successive writing 3 times

dummy data ‘0016’ to

transmit buffer register

for reception of RSP code

Receive processing completed

after recognizing that target ID is not

source ID of units other than unit B.

Priority code

‘01

××××××2’

Bus collision detected

Transmit processing

completed

Receive processing start

Bus collision detected

Transmit processing

completed

Receive processing start

Priority code

‘00

××××××2’

Priority code

Target ID

×××××××2’

‘0

(Transmit to unit B)

Target ID

××××××2’

‘00

Priority code

‘1

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