7480 datasheet(240/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

2-25

APPLICATIONS

2.3 Serial I/O

Figure 2.3.11 Communication Format Example of Simplified SAE J1850

SOF

Data area

EOD

EOF

IFS

1 byte

Max. 7 bytes

1 byte

1 frame

SOF

(Start of Frame)

Priority

Code

Source ID

ID number of

target unit

Transmit data

Code for error

detection

Indicates the end of

data

Indicates the end of

frame

Indicates the

separation between

frames

Receiver transmits

self-address if data is

correctly received on

error detection

Code for priority

control in multi-unit

transmission

4 time

2 time

When transmitting

3 time

Data

3 time

When transmitting ‘0’

When transmitting ‘1’

• 1 bit represented by 3 time (1 byte represented by 3 bytes).

• Both transmitter and receiver communicate with serial I/O.

• Priority code: ‘0016’ (high priority) through ‘FF16’ (low priority).

• Fixed format of 3 time.

• Both transmitter and receiver generate a wait time with timer 1.

3 time

6 time

• Fixed format of 6 time.

• Transmitter transmits ‘001111002’ with serial transmission.

• Receiver detects data with CNTR0 interrupt and recognizes with

pulse width measurement mode of timer X.

Transmit

data

generated

Transmit data 2

Transmit data 3

Transmit data 1

D7 D6 D5 D4 D3 D2 D1 D0

1 byte data

Transmit data 1

Transmit data 2

Transmit data 3

1 byte data transmit

Priority code

Target ID

Source ID

CRC code

RSP code

Transmit/Receive

Data Name

Function

Transmission/Reception

Indicates the head of

the frame

Target ID

IFS

(Inter-Frame

Separation)

EOF

(End of Frame)

EOD

(End of Data)

RSP Code

CRC Code

Data Area

• Fixed format of 6 time.

• Both transmitter and receiver generate a wait time with timer 1.

ID number of

transmit unit

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