Книга: Advanced PIC Microcontroller Projects in C
9.1.3 Control Field
9.1.3 Control Field
The control field is 6 bits wide, consisting of 2 reserved bits and 4 data length code (DLC) bits, and indicates the number of data bytes in the message being transmitted. This field is coded as shown in Table 9.1, where up to 8 transmit bytes can be coded with 6 bits.
Table 9.1: Coding the control field
| No. of data bytes | DLC3 | DLC2 | DLC1 | DLC0 |
|---|---|---|---|---|
| 0 | D | D | D | D |
| 1 | D | D | D | R |
| 2 | D | D | R | D |
| 3 | D | D | R | R |
| 4 | D | R | D | D |
| 5 | D | R | D | R |
| 6 | D | R | R | D |
| 7 | D | R | R | R |
| 8 | R | Dor R | D or R | D or R |
D: Dominant level, R: Recessive level.
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