mc33742 Freescale Semiconductor, Inc, mc33742 Datasheet - Page 48

• Manufacturer Part Number: mc33742
• Description: Mc33742 System Basis Chip Sbc With Enhanced High-speed Can Transceiver
• Manufacturer: Freescale Semiconductor, Inc

Table 31. TIM1 Control Bits
Table 32. Timing Register Status Bits
Table 33. TIM2 Timing and CANL Failure Diagnostic Register
48
33742
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Notes
Reset Condition (Write)
61.
No Watchdog Clear Allowed
WDW
Watchdog Timing x 50%
0
0
0
0
1
1
1
1
See
Window Closed
(Watchdog Timing Selected by TIM1 Bit WDW =1)
Reset Value
$101b
Table
TIM2
CANL2VDD
CANL2GND
CANL2BAT
Figure 28. Window Watchdog
Name
TXPD
13, page 42, for definitions of reset conditions.
WDT1
0
0
1
1
0
0
1
1
Watchdog Period
(61)
R/W
Window Open for Watchdog Clear
W
R
–
–
Watchdog Timing x 50%
WDT0
0
1
0
1
0
1
0
1
CANL2VDD
D3
1
–
–
Logic
Timing (ms typ)
0
1
0
1
0
1
0
1
9.75
9.75
100
350
100
350
45
45
No CANL short to VDD.
CANL short to VDD.
No CANL short to VSUP .
CANL short to VSUP .
No CANL short to GND.
CANL short to GND.
No TXD dominant.
TXD dominant.
POR, RESET
CANL2BAT
CSP2
D2
0
Watchdog Period 1
Watchdog Period 2
Watchdog Period 3
Watchdog Period 4
Watchdog Period 1
Watchdog Period 2
Watchdog Period 3
Watchdog Period 4
(Watchdog Timing Selected by TIM1 Bit WDW = 0)
Parameter
Figure 29. Timeout Watchdog
Window Open for Watchdog Clear
Failure Description
Analog Integrated Circuit Device Data
Watchdog Period
POR, RESET
CANL2GND
CSP1
D1
0
No Window Watchdog
Watchdog Window enabled
(Window length is half the
Watchdog Timing).
Freescale Semiconductor
Description
POR, RESET
CSP0
TXPD
D0
0