AT89C51CC02CA-RATUM datasheet(86/156 Pages) ATMEL

Part #	AT89C51CC02CA-RATUM

Description	Enhanced 8-bit Microcontroller with CAN Controller and Flash

PDF	156 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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86 / 156 page

AT/T89C51CC02

4126J–CAN–05/06

Fault Confinement

With respect to fault confinement, a unit may be in one of the three following status:

•

Error active

•

Error passive

•Bus off

An error active unit takes part in bus communication and can send an active error frame

when the CAN macro detects an error.

An error passive unit cannot send an active error frame. It takes part in bus communica-

tion, but when an error is detected, a passive error frame is sent. Also, after a

transmission, an error passive unit will wait before initiating further transmission.

A bus off unit is not allowed to have any influence on the bus.

For fault confinement, two error counters (TEC and REC) are implemented.

See CAN Specification for details on Fault confinement.

Figure 42. Line Error Mode

TEC>255

Error

Active

Error

Passive

Bus

Off

Init.

TEC<127

and

REC<127

TEC>127

REC>127

128 Occurrences

11 Consecutive

Recessive

bit

TEC: Transmit Error Counter

REC: Receive Error Counter

ERRP = 0

BOFF = 0

ERRP = 1

BOFF = 0

ERRP = 0

BOFF = 1

AT89C51CC02CA-RATUM Datasheet(PDF) 86 Page - ATMEL Corporation

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