FUNCTIONAL DEVICE OPERATIONS
LOGIC COMMANDS AND REGISTERS
REGISTER DEFINITIONS
HS1CL
HS1OP
HS2CL
HS2OP
System Status Register - SYSSR
The System Status Register (SYSSR) is always
transferred with every SPI transmission and gives a quick
system status overview. It summarizes the status of the
Voltage Status Register (VSR), LIN Status Register (LINSR),
High Side Status Register (HSSR), and the Low Side Status
Register (LSSR).
HSS
Figure 23. High Side Status
LSS - Low Side Switch Status
Table 8. System Status Register
This read-only bit indicates that one or more bits in the
LSSR are set.
S7
S6
S5
S4
1 = Low Side Status bit set
0 = None
Read
VMS
LINS
HSS
LSS
VMS - Voltage Monitor Status
LS1CL
This read-only bit indicates that one or more bits in the
VSR are set.
LS1OP
LSS
LS2CL
1 = Voltage Monitor bit set
0 = None
LS2OP
Figure 24. Low Side Status
Mode Control Register - MCR
BATFAIL
VDDOT
VMS
VSUV
VSOV
The Mode Control Register (MCR) allows switching
between the operation modes and to configure the 33912.
Writing the MCR will return the VSR.
Figure 21. Voltage Monitor Status
Table 9. Mode Control Register - $0
LINS - LIN Status
C3
C2
C1
C0
This read-only bit indicates that one or more bits in the
LINSR are set.
Write
HVSE
LINPE
MOD2
MOD1
Reset
Value
1 = LIN Status bit set
0 = None
1
1
-
-
-
-
Reset
Condition
POR
POR
LINOC
LINOT
LINS
HVSE - High-Voltage Shutdown Enable
TXDOM
This write-only bit enables/disables automatic shutdown of
the high side and the low side drivers during a high-voltage
VSOV condition.
RXSHORT
1 = automatic shutdown enabled
0 = automatic shutdown disabled
Figure 22. LIN Status
HSS - High Side Switch Status
LINPE - LIN pull-up enable.
This read-only bit indicates that one or more bits in the
HSSR are set.
This write-only bit enables/disables the 30kΩ LIN pull-up
resistor in STOP and SLEEP Modes. This bit also controls
the LIN bus wake-up threshold.
1 = High Side Status bit set
0 = None
1 = LIN pull-up resistor enabled
0 = LIN pull-up resistor disabled
33912
Analog Integrated Circuit Device Data
Freescale Semiconductor
36
FREESCALE [ Freescale ]
