33889 Datasheet, PDF (42/60 Pages) Freescale Semiconductor, Inc – System Basis Chip with Low Speed Fault Tolerant CAN Interface

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
MCTR2
0
1
1
1
1
MCTR1
1
0
0
1
1
MCTR0
1
0
1
0
1
SBC MODE
Stop, watchdog on ⁽²⁾
Sleep ⁽³⁾
Normal
Standby
Stop ⁽⁴⁾
DESCRIPTION
No watchdog running, debug mode
(1): Bit BATFAIL cannot be set by SPI. BATFAIL is set when V_SUP falls below 3V.
(2): Watchdog ON or OFF depends on the RCR register bit D3.
(3): Before entering sleep mode, bit NOSTOP in RCR register must be previously set to 1.
(4): Stop command should be replaced by Stop Watchdog OFF. MCTR2=0, MCTR1= MCTR0=1
Table 11. Status bits
STATUS BIT
GFAIL
BATFAIL
VDDTEMP
WDRST
DESCRIPTION
Logic OR of CAN failure, HS1 failure, V2LOW
Battery fail flag (V_SUP<3V)
Temperature pre-warning on VDD (latched)
Watchdog reset occurred
Table 12. RCR register
RCR
$001b
W
R
Reset
Reset condition
D3
WDSTOP
1
POR, RESET
D2
NOSTOP
0
POR, NR2N
D1
TXFAILURE
D0
RSTTH
CANWU
0
POR
33889
42
Analog Integrated Circuit Device Data
Freescale Semiconductor