AN1105 datasheet(7/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

–A RTR bit used to differentiate data and remote frames. It is dominant in a data frame.

A 6-bit control field, including:

– A 4-bit data length code bits giving the size (in bytes) of the data field

–1 IDentifier Extension (IDE) bit (dominant for CAN 2.0A frame) and 1 bit reserved for fur-

ther development.

A data field of up to 8 bytes.

A 16-bit long CRC field. The Cyclic Redundancy Check (CRC) is based on a BCH encoding.

A 2-bit acknowledgment field. The transmitters sends it as all recessive. (See “Message

Acknowledgement” on page 11)

A 7-bit end-of-frame field.

The interframe space (or Intermission) is the minimum amount of time between two consecu-

tive transmissions.

Figure 2. CAN Data Frame

1.2.2 CAN Remote Frame

The CAN Remote frame is used to request data. This frame has the same overall constitution

as the data frame. However, in this case, the Remote bit (RTR) is recessive and there is no

data field.

19 bits

25 bits

11-bit Identifier

DLC

15 bits

Bus Idle

3 bits

7 bits

EOF

ACK

CRC Field

Control

Field

Arbitration Field

SOF

RTR = 0

IDE = 0

ACK Delimiter

ACK Slot

CRC

Delimiter

Interframe

Space

Data Field

Data

0..64 bits

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