Rainbow-electronics T89C51CC01 Manual do Utilizador descarregar pdf (Página 87)

T89C51CC01

Rev. D – 17-Dec-01

Table 39. CANGSTA Register

CANGSTA (S:AAh)

CAN General Status Register

Note: 1. These fields are Read Only.

Reset Value: x0x0 0000b

76543210

- 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.

4 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.

3 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)

seeFigure36

0 ERRP

Error passive mode (1)

seeFigure36

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 148 149

T89C51CC01 1

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