UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 484

• 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

16.15 Baud Rate Settings
16.15.1 Baud rate settings
as follows.
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Make sure that the settings are within the range of limit values for ensuring correct operation of the CAN controller,
Table 16-22 shows the combinations of bit rates that satisfy the above conditions.
Remark TQ = 1/f
(a) 5TQ ≤ SPT (sampling point) ≤ 17 TQ
(b) 8 TQ ≤ DBT (data bit time) ≤ 25 TQ
(c) 1 TQ ≤ SJW (synchronization jump width) ≤ 4TQ
(d) 4 ≤ TSEG1 ≤ 16 [3 (Setting value of TSEG1 [3:0] ≤ 15]
(e) 1 ≤ TSEG2 ≤ 8 [0 (Setting value of TSEG2 [2:0] ≤ 7]
SPT = TSEG1 + 1
DBT = TSEG1 + TSEG2 + 1TQ = TSEG2 + SPT
SJW ≤ DBT – SPT
TSEG1 [3:0]:
TSEG2 [2:0]:
TQ
(f
TQ
: CAN protocol layer basic system clock)
Bits 3 to 0 of CAN0 bit rate register (C0BTR)
Bits 10 to 8 of CAN0 bit rate register (C0BTR)
CHAPTER 16 CAN CONTROLLER
User’s Manual U17554EJ4V0UD