HC05 Datasheet, PDF (64/232 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit

Data frame
(number of bits = 44 + 8N)
12
Arbitration field
11
6
Control field
4
8N (0 ≤ N ≤ 8)
Data field
8
8
16
CRC field
15
CRC
d
ddd
Identifier
Acceptance
filtering
Stored in buffers
Data
length
code
Stored in transmit/receive buffers
Bit stuffing
7
End of frame
r rrrrrrrr
Remote frame
(number of bits = 44)
12
Arbitration field
11
6
Control field
4
16
CRC field
15
CRC
7
End of frame
d
r dd
r rrrrrrrr
Note:
A remote frame is identical to a
data frame, except that the RTR
bit is recessive, and there is no
data field.