UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 394

• 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

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(4) Error state
(a) Types of error states
The following three types of error states are defined by the CAN specification.
- Error active
- Error passive
- Bus-off
These types of error states are classified by the values of the TEC7 to TEC0 bits (transmission error
counter bits) and the REC6 to REC0 bits (reception error counter bits) of the CAN error counter register
(C0ERC) as shown in Table 16-13.
The present error state is indicated by the CAN module information register (C0INFO).
When each error counter value becomes equal to or greater than the error warning level (96), the TECS0
or RECS0 bit of the C0INFO register is set to 1. In this case, the bus state must be tested because it is
considered that the bus has a serious fault. An error counter value of 128 or more indicates an error
passive state and the TECS1 or RECS1 bit of the C0INFO register is set to 1.
- If the value of the transmission error counter is greater than or equal to 256 (actually, the transmission
- If only one node is active on the bus at startup (i.e., a particular case such as when the bus is
error counter does not indicate a value greater than or equal to 256), the bus-off state is reached and
the BOFF bit of the C0INFO register is set to 1.
connected only to the local station), ACK is not returned even if data is transmitted. Consequently, re-
transmission of the error frame and data is repeated.
transmission error counter is not incremented and the bus-off state is not reached.
CHAPTER 16 CAN CONTROLLER
User’s Manual U17554EJ4V0UD
In the error passive state, however, the