33889 Datasheet, PDF (44/60 Pages) Freescale Semiconductor, Inc – System Basis Chip with Low Speed Fault Tolerant CAN Interface

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Fault tolerant CAN transceiver standard modes
The CAN transceiver standard mode can be programmed by setting CEXT to 0. The transceiver cell will then be behave as
known from MC33388.
Table 15. CAN Transceiver Modes
CEXT
0
0
0
0
CCTR1
0
0
1
1
CCTR0
0
1
0
1
Mode
TermVBAT
RxOnly
RxTx
Table 16. CAN transceiver extended modes (CAN with CEXT bit =1 is not recommended)
CEXT ⁽¹⁾
1
1
1
1
CCTR1
0
0
1
1
CCTR0
0
1
0
1
Mode
TermVBAT
TermVDD
RxOnly
RxTx
Fault tolerant CAN transceiver extended modes
By setting CEXT to 1 the transceiver cell supports sub bus communication
Note1: CEXT Bit should be set at 0. The CAN operation in extended mode is not recommended.
FDIS
0
1
L0 wake input filter (20 µs typical)
Enable (LO wake threshold selectable by WUR register)
Disable (L0 wake-up threshold is low level only, no matter D0 and D1 bits set in WUR register).
Note: if DFIS bit is set to 1, WUR register must be read before going into sleep or stop mode in order to clear the wake-up flag.
During read out L0 must be at high level and should stay high when entering sleep or stop.
33889
44
Analog Integrated Circuit Device Data
Freescale Semiconductor