Datasheet

125
AT89C51CC03
4182O–CAN–09/08
Table 81. CANIDM4 Register for V2.0 part B
CANIDM4 for V2.0 part B (S:C7h)
CAN Identifier Mask Registers 4
Note: The ID Mask is only used for reception.
No default value after reset.
Table 82. CANMSG Register
CANMSG (S:A3h)
CAN Message Data Register
No default value after reset.
76543210
IDMSK 4 IDMSK 3 IDMSK 2 IDMSK 1 IDMSK 0 RTRMSK - IDEMSK
Bit
Number Bit Mnemonic Description
7-3 IDMSK4:0
IDentifier Mask Value
0 - comparison true forced.
1 - bit comparison enabled.
See Figure 54.
2RTRMSK
Remote Transmission Request Mask Value
0 - comparison true forced.
1 - bit comparison enabled.
1-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0IDEMSK
IDentifier Extension Mask Value
0 - comparison true forced.
1 - bit comparison enabled.
76543210
MSG 7MSG 6MSG 5MSG 4MSG 3MSG 2MSG 1MSG 0
Bit
Number Bit Mnemonic Description
7-0 MSG7:0
Message Data
This register contains the mailbox data byte pointed at the page message
object register.
After writing in the page message object register, this byte is equal to the
specified message location (in the mailbox) of the pre-defined identifier +
index. If auto-incrementation is used, at the end of the data register writing or
reading cycle, the mailbox pointer is auto-incremented. The range of the
counting is 8 with no end loop (0, 1,..., 7, 0,...)