UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 386

• 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

386
<4> Data field
<5> CRC field
The data field contains the amount of data (byte units) set by the control field. Up to 8 units of data can
be set.
The CRC field is a 16-bit field that is used to check for errors in transmit data.
Remark
Remark
- The polynomial P(X) used to generate the 15-bit CRC sequence is expressed as follows.
- Transmitting node: Transmits the CRC sequence calculated from the data (before bit stuffing) in the
- Receiving node:
P(X) = X15 + X14 + X10 + X8 + X7 + X4 + X3 + 1
R
D
(Control field)
(Data field or control field)
R
D
D: Dominant = 0
R: Recessive = 1
D: Dominant = 0
R: Recessive = 1
MSB
start of frame, arbitration field, control field, and data field.
Compares the CRC sequence calculated using data bits that exclude the stuffing
bits in the receive data with the CRC sequence in the CRC field. If the two CRC
sequences do not match, the node issues an error frame.
(8 bits)
Data0
CHAPTER 16 CAN CONTROLLER
User’s Manual U17554EJ4V0UD
Figure 16-10. CRC Field
Figure 16-9. Data Field
LSB
Data field
CRC sequence
(15 bits)
CRC field
MSB
(8 bits)
Data7
CRC delimiter
(1 bit)
LSB
(ACK field)
(CRC field)