BAT32G1x9 user manual | Chapter 30 Power-on reset circuit
1089 / 1149
Rev.1.02
Fig. 29-2 Timing of the generation of internal reset signals in the power-on reset circuit and
voltage detection circuit (1/3).
(1) The case of using an external reset input from the RESETB pin
low limit of working
voltage range
V
POR
=1.51V(TYP.)
V
PDR
=1.50V(TYP.)
note 5
note 5
at least 10us
wait till osc precision
stablized
note 1
wait till osc precision
stablized
note 1
start oscillating via
software configuration
start oscillating via
software configuration
power supply
voltage(V
DD
)
0V
RESETB pin
high speed internal
osc clock(fIH)
high speed system clock
(fMX)
(Scenario of selecting
X1 oscilation)
stop operation
CPU
wait time of voltage stablization 0.99ms(TYP.),2.30ms(MAX)
reset processing time while
releasing external reset
note 3
normal operation
(high speed internal osc clock)
note 2
normal operation
(high speed internal osc clock)
not
e 2
reset processing time while
releasing external reset
note 3
reset period
(osc stop)
internal reset signal
stop
operation
Note 1
The internal reset processing time includes the oscillation accuracy stabilization wait time for the high-speed
internal oscillator clock.
2. Can switch the
CPU
clock from a high-speed internal oscillator clock to a high-speed system clock or a sub-system
clock. In the
case of
an X1
clock, the oscillation settling time must be
switched after the oscillation settling time is
confirmed by the state register (OSTC) of the oscillation settling time counter; In the case of using
the XT1
clock, it
is necessary to switch after confirming the oscillation stabilization time using the timer function, etc.
3. The time until the start of normal operation except for reaching
V
POR
(1.51V (TYP.).
After
the "voltage stabilization
wait time", the
following "is
required" after setting the
RESETB
signal high (
"1"). Reset processing time when the
external reset is lifted (
the
first
time
after the
POR
is
released)". The reset processing time when the external reset
is released is as follows:
1st
time after
POR
released
:
0.672ms (TYP.
).
, 0.832ms(MAX.)
(in the case
of
LVD).
0.399ms(TYP.) , 0.519ms(MAX.)
(when
LVD
is
not used).
4. The reset
processing time when the external reset is released after the second time after the POR is released as
follows:
After
2nd
time after
the POR is
released: 0.531ms (TYP.
).
, 0.675ms(MAX.)
(in the case
of
LVD).
0.259ms(TYP.) , 0.362ms(MAX.)
(when
LVD
is
not used).
5. When the power supply voltage rises, the power supply voltage must be
maintained by external reset before it
reaches the working voltage range shown in
the AC
characteristics
of the data sheet
; When the supply voltage
drops, it must be reset through
deep sleep mode transfer, voltage detection circuitry,
or external reset before the
supply voltage falls below
the operating voltage range. When restarting operation, you must confirm that the
supply voltage has returned to the operating voltage range.
Note V
POR
:
The POR
supply voltage rises to the detection voltage
V
PDR
:
POR
supply voltage drop sense voltage
Note that when LVD
is
OFF, an
external reset of the RESET B pin must be used. For details, please refer to