BAT32G1x9 user manual | Chapter 30 Power-on reset circuit
1091 / 1149
Rev.1.02
Figure 29-2 Timing of the generation of internal reset signals in the power-on reset circuit
and voltage detection circuit (3/3).
(3) The case of LVD reset mode (LVIMDS1 for option bytes 000C1H, LVIMDS0=1, 1).
low limit of working
voltage range
V
POR
=1.51V(TYP.)
V
PDR
=1.50V(TYP.)
power supply
voltage(V
DD
)
0V
high speed internal osc
clock(fIH)
high speed system clock
(fMX) (Scenario of selecting
X1 oscilation)
stop
operation
CPU
internal reset signal
V
LVD
wait time of voltage stabli POR reset
processing time
1.64ms(TYP), 3.10ms(MAX).
wait till osc precision
stablized
note1
wait till osc precision
stablized
note1
start oscillating via
software configuration
start oscillating via
software configuration
normal operation (high speed
internal osc clock)
note2
normal operation (high speed
internal osc clock)
note2
reset period
(osc stop)
reset period
(osc stop)
LVD reset processing time
note3
LVD reset processing time
note3
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.).
In
addition to
the "Voltage
Stabilization Wait Time
+ POR
Reset Processing Time", the
following is required after the
LVD
detection level
(V
LVD
) is reached LVD
Reset Processing Time.
LVD reset processing time:
0ms~0.0701ms(MAX.
).
4. When the supply voltage drops, if the supply voltage is only
restored after the internal reset of the voltage
detection circuit
(
LVD
) occurs, the following "LVD"
is required after reaching the
LVD
detection level (V
LVD). Reset Processing
Time".
LVD reset processing time:
0.0511ms (TYP.
).
, 0.0701ms(MAX.)
Note 1
V
LVDH
,
V
LVDL
:
LVD
sense voltage
V
POR
:
The POR
power supply rises the sense voltage
V
PDR
:
The POR
supply drops the sense voltage
2. When the LVD
interrupt mode is selected (LVIMD1
,
LVIMD0=0,
1
for option byte 000C1H
), the time from the
time of power on to the start of normal operation The time of "Note
3
"
of
"
Figure
29-2(3)
LVD
bit mode case"
is
the same.