# CAN CC

Protocols · `CAN CC` · verification: source checked

CAN CC (Classical CAN) is a serial broadcast network standard for embedded control systems, standardized at the data link layer in ISO 11898-1. Nodes transmit frames with an 11-bit or 29-bit identifier; lower identifier values have higher priority and simultaneous access is resolved by bit-wise arbitration. It includes error detection, error frames and fault confinement to maintain data consistency.

## Specification

| Property | Value |
|---|---|
| Transports | serial |
| Architecture | producer consumer |
| Encoding | binary |
| Standard body | ISO |
| Standard ref | ISO 11898-1 |

## Safety

- Error frames abort an ongoing transmission when any node detects an error, forcing other nodes to detect the error and maintaining network-wide data consistency.
- Fault confinement switches off the CAN interface of a faulty node (bus-off state) to prevent permanent disturbance of CAN communication.
- After an error frame, receivers expect retransmission of the aborted data frame.
- Older CAN CC implementations may only accept the base frame format or only tolerate the extended frame format; since 2003 implementations shall handle both formats.

## Study notes

- CAN CC uses broadcast communication; each data frame carries a CAN identifier intended to be unique in the network and to indicate content and access priority.
- The identifier is an 11-bit value in CBFF or a 29-bit value in CEFF; the lowest identifier value has the highest priority.
- Simultaneous access is resolved by bit-wise arbitration using dominant and recessive states; nodes that lose arbitration become receivers.
- The DLC indicates the data field length in bytes; the data field carries 0 to 8 application data bytes.
- The protocol defines five error detection mechanisms: CRC, frame check, ACK error, bit monitoring and bit stuffing.
- Bit coding is NRZ; bit stuffing inserts a complementary stuff bit after five consecutive bits of the same value.
- A 3-bit intermission field is the minimum separation between consecutive frames; the inter-frame space may also include bus idle time and an 8-bit suspend transmission for an error-passive node.
- Extended frame format has at least 20 bit times longer network latency, requires about 20% more bandwidth and has lower error detection performance because the 15-bit CRC polynomial is optimized for frame lengths up to 112 bit.

## Sources

1. [CAN CC](https://www.can-cia.org/can-knowledge/can-cc) (accessed 2026-10-25)

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