UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 392

• 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

16.3 Functions
16.3.1 Determining bus priority
16.3.2 Bit stuffing
bits, in order to prevent a burst error.
16.3.3 Multi masters
master.
16.3.4 Multi cast
the same identifier can be set to two or more nodes.
16.3.5 CAN sleep mode/CAN stop mode function
consumption.
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Transmission
Reception
Level match
Level mismatch
Bit stuffing is used to establish synchronization by appending 1-bit inverted data if the same level continues for 5
As the bus priority (a node acquiring transmit functions) is determined by the identifier, any node can be the bus
Although there is one transmitting node, two or more nodes can receive the same data at the same time because
The CAN sleep mode/CAN stop mode function puts the CAN controller in waiting mode to achieve low power
(1) When a node starts transmission:
(2) When more than one node starts transmission:
(3) Priority of data frame and remote frame
Remark If the extended-format data frame and the standard-format remote frame conflict on the bus (if ID28 to
- During bus idle, the node that output data first transmits the data.
- The node that outputs the dominant level for the longest consecutively from the first bit of the arbitration field
- The transmitting node compares its output arbitration field and the data level on the bus.
- When a data frame and a remote frame are on the bus, the data frame has priority because its RTR bit, the
last bit in the arbitration field, carries a dominant level.
acquires the bus priority (if a dominant level and a recessive level are simultaneously transmitted, the
dominant level is taken as the bus value).
ID18 of both of them are the same), the standard-format remote frames takes priority.
During the transmission of a data frame or remote frame, when the same level continues for 5 bits in the data
between the start of frame and the ACK field, 1 inverted-level bit of data is inserted before the following bit.
During the reception of a data frame or remote frame, when the same level continues for 5 bits in the data
between the start of frame and the ACK field, reception is continued after deleting the next bit.
Continuous transmission
Continuous transmission
Table 16-9. Determining Bus Priority
CHAPTER 16 CAN CONTROLLER
Table 16-10. Bit Stuffing
User’s Manual U17554EJ4V0UD