Preliminary – Rainbow Electronics T89C51CC02 User Manual
Page 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
7
-
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
5
-
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