BAT32G1x9 user manual | Chapter 30 Power-on reset circuit
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Rev.1.02
Chapter 30 Power-on reset circuit
30.1 Function of the power-on reset circuit
The power-on reset circuit (POR) has the following functions.
• Generates an internal reset signal when power is turned on.
If the supply voltage (VDD) exceeds the sense voltage (VPOR), the reset is dismissed. However, the reset state
must be maintained by voltage detection circuitry or an external reset until the supply voltage reaches the
operating voltage range shown in the AC characteristics of the data sheet.
• Drag the supply voltage (V
DD
) and the detection voltage (V
PDR
) to compare. While V
DD
＜
V
PDR
, an
internal reset signal is generated. However, when the supply voltage drops, the supply voltage must
be lower than Data sheet And characteristic Before the operating voltage range shown, It is reset by
means of transfer in deep sleep mode, voltage detection circuitry, or external reset. When restarting
operation, you must confirm that the supply voltage has returned to the operating voltage range.
Note When the power-on reset circuit generates an internal reset signal, the reset control flag register ( RESF) is
cleared
to "00H".
Note 1
The BAT32G1x9
includes several hardware that generates an internal reset signal. When an internal reset signal is
generated by a watchdog timer
(WDT), voltage detection
(LVD) circuit, system reset request position bit,
RAM
parity
error, or access to illegal memory, Flags used to represent the reset source are assigned in the
REF
register; When
an internal reset signal is generated due to
the assertion of
the WDT
,
LVD, system reset request bit,
RAM
parity
error, or illegal memory access, the
RSF
register is not
cleared
to "00H" Instead, place the flag "1". For details
on
RESF
registers, please refer to
2.V
POR
:
POR
supply voltage rises to detect voltage
V
PDR
:
POR
supply voltage drop sense voltage
For details, please refer to the POR
circuit characteristics
in the data sheet.