Cann Control Register (Cnctrl) - NEC Renesas V850/SC1 User Manual

19.5.19 CANn control register (CnCTRL)

The CnCTRL register is used to control the operation of the CAN module.
This register can be read/written in 16-bit units.
The C2CTRL register is valid only in models µ PD703089Y and 70F3089Y.
Cautions 1. Both bitwise writing and direct writing to the CnCTRL register are prohibited. Attempts to
write directly to this register may result in operation faults, so be sure to follow the sequence
described in 19.6 Cautions Regarding Bit Set/Clear Function.
2. When writing to the CnCTRL register, set or clear bits according to the register configuration
shown in part (b) Write of the following figure.
3. When canceling CAN stop mode, CAN sleep mode must be cancelled at the same time.
After reset: 0101H
(a) Read 15
CnCTRL TECS1
(n = 1, 2) 7
0
(b) Write 15
CnCTRL 0
(n = 1, 2) 7
0
(a) Read
TECS1
0
0
1
1
RECS1
0
0
1
1
BOFF
0
1
608
CHAPTER 19 FCAN CONTROLLER (V850/SC3)
R/W Addresses: C1CTRL: xx3FFC50H
14 13 12
TECS0 RECS1 RECS0
6 5 4
DLEVR DLEVT OVM
14 13 12
set DLEVR set DLEVT set OVM
6 5 4
clear DLEVR clear DLEVT clear OVM clear TMR clear STOP clear SLEEP clear INIT
TECS0
0 Transmit error counter value < 96
1 Transmit error counter value = 96 to 127 (warning level)
0 Not used
Transmit error counter value ≥ 128 (error passive)
1
RECS0
0 Receive error counter value < 96
1 Receive error counter value = 96 to 127 (warning level)
0 Not used
Receive error counter value ≥ 128 (error passive)
1
Transmit error counter value < 256 (not bus off status)
Transmit error counter value ≥ 256 (bus off status)
User's Manual U15109EJ3V0UD
C2CTRL: xx3FFC90H
11 10
BOFF TSTAT RSTAT
3 2
TMR STOP
11 10
set TMR set STOP set SLEEP
3 2
Status of transmit error counter
Status of receive error counter
Bus off status flag
(1/4)
9 8
ISTAT
1 0
SLEEP INIT
9 8
set INIT
1 0