Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 185)

185

7647A–AVR–02/08

ATmega32/64/M1/C1

16.10 General CAN Registers

16.10.1 CAN General Control Register - CANGCON

• Bit 7 – ABRQ: Abort Request

This is not an auto resettable bit.

– 0 - no request.

– 1 - abort request: a reset of CANEN1 and CANEN2 registers is done. The pending

communications are immediately disabled and the on-going one will be normally

terminated, setting the appropriate status flags.

Note that CANCDMOB register remain unchanged.

• Bit 6 – OVRQ: Overload Frame Request

This is not an auto resettable bit.

– 0 - no request.

– 1 - overload frame request: send an overload frame after the next received frame.

The overload frame can be traced observing OVFG in CANGSTA register (c.f. Figure 16-9 on

page 176).

• Bit 5 – TTC: Time Trigger Communication

– 0 - no TTC.

–1 - TTC mode.

• Bit 4 – SYNTTC: Synchronization of TTC

This bit is only used in TTC mode.

– 0 - the TTC timer is caught on SOF.

– 1 - the TTC timer is caught on the last bit of the EOF.

• Bit 3 – LISTEN: Listening Mode

– 0 - no listening mode.

– 1 - listening mode.

• Bit 2 – TEST: Test Mode

– 0 - no test mode

– 1 - test mode: intend for factory testing and not for customer use.

Note: CAN may malfunction if this bit is set.

• Bit 1 – ENA/STB: Enable / Standby Mode

Because this bit is a command and is not immediately effective, the ENFG bit in CANGSTA reg-

ister gives the true state of the chosen mode.

Bit 76543210

ABRQ OVRQ TTC SYNTTC LISTEN TEST ENA/STB

SWRES CANGCON

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value00000000

1 2 ... 180 181 182 183 184 185 186 187 188 189 190 ... 365 366

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 185