AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 246

• 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

General CAN Registers
CAN General Control Register
- CANGCON
246
AT90CAN128
• Bit 7 – ABRQ: Abort Request
This is not an auto resettable bit.
• Bit 6 – OVRQ: Overload Frame Request
This is not an auto resettable bit.
The overload frame can be traced observing OVFG in CANGSTA register (c.f. Figure
116 on page 237).
• Bit 5 – TTC: Time Trigger Communication
• Bit 4 – SYNTTC: Synchronization of TTC
This bit is only used in TTC mode.
• Bit 3 – LISTEN: Listening Mode
• Bit 2 – TEST: Test Mode
• Bit 1 – ENA/STB: Enable / Standby Mode
Because this bit is a command and is not immediately effective, the ENFG bit in CANG-
STA register gives the true state of the chosen mode.
Bit
Read/Write
Initial Value
–
–
–
–
–
–
–
–
–
–
–
–
*NOTICE:CAN may malfunction if this bit is set.
–
–
0 - no request.
1 - abort request: a reset of the CONMOB bits in CANCDMOB register is done
for every MOb. The pending communications are immediately disabled and the
on-going one will be normally terminated, setting the appropriate status flags.
0 - no request.
1 - overload frame request: send an overload frame after the next received
frame.
0 - no TTC.
1- TTC mode.
0 - the TTC timer is caught on SOF.
1 - the TTC timer is caught on the last bit of the EOF.
0 - no listening mode.
1 - listening mode.
0 - no test mode
1 - test mode: intend for factory testing and not for customer use.
0 - standby mode: the on-going communication is normally terminated and the
CAN channel is frozen (the CONMOB bits of every MOb do not change). The
transmitter constantly provides a recessive level. In this mode, the receiver is
not enabled but all the registers and mailbox remain accessible from CPU.
1 - enable mode: the CAN channel enters in enable mode once 11 recessive
bits has been read.
ABRQ
R/W
7
0
OVRQ
R/W
6
0
TTC
R/W
5
0
SYNTTC
R/W
4
0
LISTEN
R/W
3
0
TEST
R/W
2
0
ENA/STB
R/W
1
0
SWRES
R/W
0
0
4250C–CAN–03/04
CANGCON