AT89C51CC03U-RDTIM datasheet(99/195 Pages) ATMEL

No de pièce	AT89C51CC03U-RDTIM

Description	Enhanced 8-bit MCU with CAN Controller and Flash Memory

PDF	195 Pages

Scroll/Zoom	100%

Fabricant	ATMEL [ATMEL Corporation]

Site Internet	http://www.atmel.com

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AT89C51CC03

4182I–CAN–06/05

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 53. 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 = 0

BOFF = 1

ERRP = 0

BOFF = 0

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