AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 247

• Manufacturer Part Number: AT90CAN128-16AE
• Description: 8-bit Avr Microcontroller With 128K Bytes of Isp Flash And CAN Controller.flash (Kbytes) 128 Vcc (V) 2.7-5.5 EEPROM (Kbytes) 4 SRAM (bytes) 4K CAN (mess. Obj.) 15
• Manufacturer: ATMEL Corporation

CAN General Status Register -
CANGSTA
4250C–CAN–03/04
• Bit 0 – SWRES: Software Reset Request
This auto resettable bit only resets the CAN controller.
• Bit 7 – Reserved Bit
This bit is reserved for future use.
• Bit 6 – OVFG: Overload Frame Flag
This flag does not generate an interrupt.
• Bit 5 – Reserved Bit
This bit is reserved for future use.
• Bit 4 – TXBSY: Transmitter Busy
This flag does not generate an interrupt.
• Bit 3 – RXBSY: Receiver Busy
This flag does not generate an interrupt.
• Bit 2 – ENFG: Enable Flag
This flag does not generate an interrupt.
• Bit 1 – BOFF: Bus Off Mode
BOFF gives the information of the state of the CAN channel. Only entering in bus off
mode generates the BOFFIT interrupt.
Bit
Read/Write
Initial Value
–
–
–
–
–
–
–
–
–
–
–
–
0 - no reset
1 - reset: this reset is “ORed” with the hardware reset.
0 - no overload frame.
1 - overload frame: set by hardware as long as the produced overload frame is
sent.
0 - transmitter not busy.
1 - transmitter busy: set by hardware as long as a frame (data, remote, overload
or error frame) or an ACK field is sent. Also set when an inter frame space is
sent.
0 - receiver not busy
1 - receiver busy: set by hardware as long as a frame is received or monitored.
0 - CAN controller disable: because an enable/disable command is not
immediately effective, this status gives the true state of the chosen mode.
1 - CAN controller enable.
0 - no bus off mode.
1 - bus off mode.
7
-
-
-
OVFG
R
6
0
5
-
-
-
TXBSY
R
4
0
RXBSY
R
3
0
ENFG
R
2
0
AT90CAN128
BOFF
R
1
0
ERRP
R
0
0
CANGSTA
247