upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 652

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

16.15 Baud Rate Settings
16.15.1 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.
Remark:
652
(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
TQ = 1/f
TSEG1[3:0] (Bits 3 to 0 of CANn bit rate register (CnBTR))
TSEG2[2:0] (Bits 10 to 8 of CANn bit rate register (CnBTR))
TQ
(f
TQ
: CAN protocol layer basic system clock)
Chapter 16 FCAN Controller
User’s Manual U16702EE3V2UD00