MC33910BAC / MC34910BAC
FUNCTIONAL DEVICE OPERATIONS
LOGIC COMMANDS AND REGISTERS
High Side Control Register - HSCR
HSxCL - High Side Current Limitation
This register controls the operation of the high side drivers.
Writing to this register returns the High Side Status Register
(HSSR).
This read-only bit indicates that the high side switch is
operating in current Limitation mode.
1 = HSx in current limitation (or thermal shutdown)
0 = Normal
Table 47. High Side Control Register - $6
Timing Control Register - TIMCR
C3
C2
C1
C0
This register is a double purpose register which allows to
configure the watchdog and the cyclic sense periods. Writing
to the TIMCR will also return the WDSR.
Write
PWMHS2 PWMHS1
HS2
HS1
Reset
Value
0
0
0
0
Table 49. Timing Control Register - $A
Reset
Condition
POR, Reset mode, ext_reset, HSx
over-temp or (VSOV & HVSE)
POR
C3
C2
C1
C0
WD2
WD1
WD0
PWMHSx - PWM Input Control Enable
Write
CS/WD
This write-only bit enables/disables the PWMIN input pin
to control the high side switch. The high side switch must be
enabled (HSx bit).
CYST2
CYST1
CYST0
Reset
Value
-
-
0
0
0
1 = PWMIN input controls HS1 output.
0 = HSx is controlled only by SPI.
Reset
Condition
POR
HSx - High Side Switch Control.
CS/WD - Cyclic Sense or Watchdog Prescaler Select.
This write-only bit enables/disables the high side switch.
1 = HSx switch on.
This write-only bit selects which prescaler is being written
to, the cyclic sense prescaler or the watchdog prescaler.
0 = HSx switch off.
1 = Cyclic Sense Prescaler selected
0 = Watchdog Prescaler select
High Side Status Register - HSSR
This register returns the status of the high side switch and
is also returned when writing to the HSCR.
WDx - Watchdog Prescaler
This write-only bits selects the divider for the watchdog
prescaler and therefore selects the watchdog period in
accordance with Table 50. This configuration is valid only if
windowing watchdog is active.
Table 48. High Side Status Register - $6/$7
S3
S2
S1
S0
Read
HS2OP
HS2CL
HS1OP
HS1CL
Table 50. Watchdog Prescaler
WD2
WD1
WD0
Prescaler Divider
High Side thermal shutdown
A thermal shutdown of the high side drivers is indicated by
setting the HSxOP and HSxCL bits simultaneously.
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
2
4
HSxOP - High Side Switch Open-Load Detection
6
This read-only bit signals that the high side switch is
conducting current below a certain threshold indicating
possible load disconnection.
8
10
12
14
1 = HSx Open Load detected (or thermal shutdown)
0 = Normal
33910
Analog Integrated Circuit Device Data
Freescale Semiconductor
82
FREESCALE [ Freescale ]
