UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 381

• 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 CAN Protocol
automotive applications (class C).
specifications.
link layer includes logical link and medium access control. The composition of these layers is illustrated below.
16.2.1 Frame format
CAN (Controller Area Network) is a high-speed multiplex communication protocol for real-time communication in
The CAN specification is generally divided into two layers: a physical layer and a data link layer. In turn, the data
(1) Standard format frame
(2) Extended format frame
Higher
Lower
- The standard format frame uses 11-bit identifiers, which means that it can handle up to 2048 messages.
- The extended format frame uses 29-bit (11 bits + 18 bits) identifiers which increase the number of
- Extended format frame is set when “recessive level” (CMOS level equals “1”) is set for both the SRR and
Note CAN controller specification
messages that can be handled to 2048 x 218 messages.
IDE bits in the arbitration field.
Data link
layer
Physical layer
Note
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Logical link control (LLC)
Medium access control (MAC)
CAN is prescribed by ISO 11898.
Figure 16-2. Composition of Layers
CHAPTER 16 CAN CONTROLLER
User’s Manual U17554EJ4V0UD
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Prescription of signal level and bit description
Acceptance filtering
Overload report
Recovery management
Data capsuled/not capsuled
Frame coding (stuffing/not stuffing)
Medium access management
Error detection
Error report
Acknowledgement
Seriated/not seriated
For details, refer to the ISO 11898
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