AT89C51CC03U-RDTIM datasheet(108/195 Pages) ATMEL

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108

AT89C51CC03

4182I–CAN–06/05

Table 49. CANGSTA Register

CANGSTA (S:AAh)

CAN General Status Register

Note:

1. These fields are Read Only.

Reset Value = x0x0 0000b

543

210

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(1)

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.

TBSY

Transmitter Busy(1)

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.

RBSY

Receiver Busy(1)

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(1)

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(1)

see Figure 53

0ERRP

Error Passive Mode(1)

see Figure 53

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