33912 Datasheet, PDF (37/47 Pages) Freescale Semiconductor, Inc – LIN System Basis Chip with DC Motor Pre-driver and Current

FUNCTIONAL DEVICE OPERATIONS
LOGIC COMMANDS AND REGISTERS
MOD2, MOD1 - Mode Control Bits
These write-only bits select the operating mode and allow
clearing the watchdog in accordance with Table 10 Mode
Control Bits.
Table 10. Mode Control Bits
MOD2 MOD1
Description
0
0
0
1
1
0
1
1
Normal Mode
Stop Mode
Sleep Mode
Normal Mode + Watchdog Clear
Voltage Status Register - VSR
Returns the status of the several voltage monitors. This
register is also returned when writing to the Mode Control
Register (MCR).
Table 11. Voltage Status Register - $0/$1
S3
S2
S1
S0
Read
VSOV
VSUV
VDDOT BATFAIL
VSOV - V_SUP Over-Voltage
This read-only bit indicates an over-voltage condition on
the VS1 pin.
1 = Over-voltage condition.
0 = Normal condition.
VSUV - V_SUP Under-Voltage
This read-only bit indicates an under-voltage condition on
the VS1 pin.
1 = Under-voltage condition.
0 = Normal condition.
VDDOT - Main Voltage Regulator Over-temperature
Warning
This read-only bit indicates that the main voltage regulator
temperature reached the Over-temperature Prewarning
Threshold.
1 = Over-temperature Prewarning
0 = Normal
BATFAIL - Battery Fail Flag.
This read-only bit is set during power-up and indicates that
the 33912 had a Power-On-Reset (POR).
Any access to the MCR or VSR will clear the BATFAIL flag.
1 = POR Reset has occurred
0 = POR Reset has not occurred
Wake-Up Control Register - WUCR
This register is used to control the digital wake-up inputs.
Writing the WUCR will return the Wake-Up Status Register
(WUSR).
Table 12. Wake-Up Control Register - $2
C3
C2
C1
C0
Write
L4WE
L3WE
L2WE
L1WE
Reset
1
1
1
1
Value
Reset
Condition
POR, Reset Mode or ext_reset
LxWE - Wake-up Input x Enable
This write-only bit enables/disables which Lx inputs are
enabled. In Stop and Sleep Mode the LxWE bit determines
which wake inputs are active for wake-up. If one of the Lx
inputs is selected on the analog multiplexer, the
corresponding LxWE is masked to 0.
1 = Wake-Up Input x enabled.
0 = Wake-Up Input x disabled.
Wake-Up Status Register - WUSR
This register is used to monitor the digital wake-up inputs
and is also returned when writing to the WUCR.
Table 13. Wake-Up Status Register - $2/$3
S3
S2
S1
S0
Read
L4
L3
L2
L1
Lx - Wake-up input x
This read-only bit indicates the status of the corresponding
Lx input. If the Lx input is not enabled, then the according
Wake-Up status will return 0.
After a wake-up from Stop or Sleep Mode these bits also
allow to determine which input has caused the wake-up, by
first reading the Interrupt Status Register (ISR) and then
reading the WUSR.
1 = Lx Wake-up.
0 = Lx Wake-up disabled or selected as analog input.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33912
37