UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 382

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

16.2.2 Frame types
16.2.3 Data frame and remote frame
382
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>
CHAPTER 16 CAN CONTROLLER
Table 16-2. Frame Types
Figure 16-3. Data Frame
User’s Manual U17554EJ4V0UD
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>