ST92141 STMicroelectronics, ST92141 Datasheet - Page 74

• Manufacturer Part Number: ST92141
• Description: 8/16-bit Mcu For 3-phase Ac Motor Control
• Manufacturer: STMicroelectronics

ST92141 - RESET AND CLOCK CONTROL UNIT (RCCU)
5.6 RESET/STOP MANAGER
The Reset/Stop Manager resets the MCU when
one of the three following events occurs:
– A Hardware reset, initiated by a low level on the
– A Software reset, initiated by a HALT instruction
– A Watchdog end of count condition.
The Low Voltage Detector (LVD) (see Section 5.8)
generates a reset when:
– the power supply, when rising, is under the LVD
Figure 37. Oscillator Start-up Sequence and Reset Timing
74/179
(*) with 4 MHz quartz
Reset pin.
(when enabled).
V
LVDR
V
V
OSCIN
OSCOUT
RESET
PIN
INTCLK
1
DD
DD
MAX
MIN
Threshold.
T
START-UP
T
5.1 ms (*)
INTCLK
– the power supply, when falling, is under the LVD
The event which caused the last Reset is flagged
in the CLK_FLAG register, by setting the SOF-
TRES or the WDGRES bits respectively; a hard-
ware initiated reset will leave both these bits reset.
The hardware reset overrides all other conditions
and forces the ST9 to the reset state. During Re-
set, the internal registers are set to their reset val-
ues, where these are defined, and the I/O pins are
set to the Bidirectional Weak Pull-up mode.
Reset is asynchronous: as soon as the reset pin is
driven low, a Reset cycle is initiated.
V
LVDF
Threshold.
VR02085A