UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 530

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

15.2.2 Frame types
15.2.3 Data frame and remote frame
528
Data frame
Remote frame
Error frame
Overload frame
The following four types of frames are used in the CAN protocol.
(1) Bus value
(1) Data frame
The bus values are divided into dominant and recessive.
- Dominant level is indicated by logical 0.
- Recessive level is indicated by logical 1.
- When a dominant level and a recessive level are transmitted simultaneously, the bus value becomes
A data frame is composed of seven fields.
Frame Type
dominant level.
Remark
R
D
<1>
D: Dominant = 0
R: Recessive = 1
<2>
Frame used to transmit data
Frame used to request a data frame
Frame used to report error detection
Frame used to delay the next data frame or remote frame
<3>
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 15 CAN CONTROLLER
Table 15-2. Frame Types
Figure 15-3. Data Frame
Data frame
<4>
Description
<5>
<6> <7>
ACK field
CRC field
Data field
Control field
Arbitration field
Start of frame (SOF)
End of frame (EOF)
Interframe space
<8>