Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 20 CAN CONTROLLER
R01UH0042EJ0500 Rev.5.00 Page 1009 of 1513
Aug 12, 2011
20.15 Baud Rate Settings
20.15.1 Bit rate setting conditions
Make sure that the settings are within the range of limit values for ensuring correct operation of the CAN controller, as
follows.
(a) 5TQ ≤ SPT (sampling point) ≤ 17 TQ
SPT = TSEG1 + 1TQ
(b) 8 TQ ≤ DBT (data bit time) ≤ 25 TQ
DBT = TSEG1 + TSEG2 + 1TQ = TSEG2 + SPT
(c) 1 TQ ≤ SJW (synchronization jump width) ≤ 4TQ
SJW ≤ DBT – SPT
(d) 4TQ ≤ TSEG1 ≤ 16TQ [3 ≤ Setting value of TSEG1[3:0] ≤ 15]
(e) 1TQ ≤ TSEG2 ≤ 8TQ [0 ≤ Setting value of TSEG2[2:0] ≤ 7]
Remark TQ = 1/f
TQ (fTQ: CAN protocol layer base system clock)
TSEG1[3:0] (C0BTR.TSEG13 to C0BTR.TSEG10 bits)
TSEG2[2:0] (C0BTR.TSEG22 to C0BTR.TSEG20 bits)
Table 20-22 shows the combinations of bit rates that satisfy the above conditions.