AT89C51CC02CA-RATUM datasheet(95/159 Pages) ATMEL

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AT/T89C51CC02

4126L–CAN–01/08

Table 57. CANGSTA Register

CANGSTA (S:AAh Read Only)

CAN General Status Register

Reset Value = x0x0 0000b

765

43210

OVFG

TBSY

RBSY

ENFG

BOFF

ERRP

Bit Number

Bit Mnemonic

Description

Reserved

The values read from this bit is indeterminate. Do not set this bit.

6OVFG

Overload frame flag

This status bit is set by the hardware as long as the produced

overload frame is sent.

This flag does not generate an interrupt

Reserved

The values read from this bit is indeterminate. Do not set this bit.

4TBSY

Transmitter busy

This status bit is set by the hardware as long as the CAN

transmitter generates a frame (remote, data, overload or error

frame) or an ack field. This bit is also active during an InterFrame

Spacing if a frame must be sent.

This flag does not generate an interrupt.

3RBSY

Receiver busy

This status bit is set by the hardware as long as the CAN receiver

acquires or monitors a frame.

This flag does not generate an interrupt.

2ENFG

Enable on-chip CAN controller flag

Because an enable/disable command is not effective immediately,

this status bit gives the true state of a chosen mode.

This flag does not generate an interrupt.

1BOFF

Bus off mode

See Figure 42

ERRP

Error passive mode

See Figure 42

AT89C51CC02CA-RATUM Datasheet(PDF) 95 Page - ATMEL Corporation

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