mfr4200 Freescale Semiconductor, Inc, mfr4200 Datasheet - Page 211

• Manufacturer Part Number: mfr4200
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

4.3.3
This functional block monitors output V
V
Due to its role during chip power-up, this module must be active in all operating modes of VREG3V3V2.
4.3.4
Block LVR monitors the primary output voltage V
LVR asserts and when rising above the deassertion level (V
function is available only in full-performance mode.
4.3.5
This part contains digital functionality needed to control the operating modes.
4.4
This subsection describes how VREG3V3V2 controls the reset of the CC. The reset values of registers and
signals are provided in
Table
4.4.1
During chip power-up the digital core may not work if its supply voltage V
deassertion level (V
is kept high until V
continues the start-up sequence.
4.4.2
For information on low-voltage reset see
Freescale Semiconductor
PORD
4-2.
, the signal goes low. The transition to low forces the CPU into the power-on sequence.
Resets
POR — Power On Reset
LVR — Low Voltage Reset
CTRL — Regulator Control
Power On Reset
Low Voltage Reset
Power-on reset
Low-voltage reset
DD
PORD
Reset Source
exceeds V
Section 3.2, “Memory Map and
). Therefore, signal POR, which forces the other blocks of the device into reset,
Table 4-2. VREG3V3V2 — Reset Sources
PORD
. Then POR becomes low and the reset generator of the device
MFR4200 Data Sheet, Rev. 0
DD
Always active
Always active
Section 4.3.4, “LVR — Low Voltage
. If V
DD
DD
is below V
. If it drops below the assertion level (V
Registers”. Possible reset sources are listed in
Local Enable
LVRD
PORD
) signal LVR negates again. The LVR
, signal POR is high; if it exceeds
Dual Output Voltage Regulator (VREG3V3V2)
DD
is below the POR
Reset”.
LVRA
) signal
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