Rainbow-electronics T89C51CC02 Bedienungsanleitung PDF herunterladen (Seite 82)

82 Rev.A - May 17, 2001

Preliminary

T89C51CC02

CANGSTA (S:AAh)

CAN General Status Register

NOTE:

1. These fields are Read Only.

Reset Value: x0x0 0000b

Figure 66. CANGSTA Register

7 6 5 4 3 2 1 0

- OVFG - TBSY RBSY ENFG BOFF ERRP

Bit Number Bit Mnemonic Description

Reserved

The values read from this bit isindeterminate. Do not set this bit.

6 OVFG

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 isindeterminate. 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.

2 ENFG

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.

1 BOFF

Bus off mode (1)

see Figure 61

0 ERRP

Error passive mode (1)

see Figure 61

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 136 137

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Rainbow-electronics T89C51CC02 Bedienungsanleitung Seite 82