RL78/G1P
CHAPTER 19 VOLTAGE DETECTOR
R01UH0895EJ0100 Rev.1.00
642
Nov 29, 2019
(2) Delay from the time LVD reset source is generated until the time LVD reset has been generated or released
There is some delay from the time supply voltage (V
DD
) < LVD detection voltage (V
LVD
) until the time LVD reset has
been generated.
In the same way, there is also some delay from the time LVD detection voltage (V
LVD
)
supply voltage (V
DD
) until the
time LVD reset has been released (see
Figure 19-10
).
Figure 19-10. Delay from the time LVD reset source is generated until the time LVD reset has been generated or released
V
LVD
Supply voltage (V
DD
)
LVD reset signal
<1>
Time
<1>
<1>: Detection delay (300
s (MAX.))
(3)
However, when the operating voltage falls while interrupt mode is set, enter STOP mode, or enable the reset status
using the external reset pin before the voltage falls below the operating voltage range shown in
27.4 AC
Characteristics
. When restarting operation, confirm that the supply voltage has returned to the operating voltage
range.
(4)
When the LVD is off, it is necessary to perform an external reset. For an external reset, input a low level for 10
s or
more to the RESET
____________
pin. To perform an external reset when power is applied, input a low level to the RESET
____________
pin
before power-on, keep the low level for at least 10
s during the period in which the supply voltage is within the
operating voltage range shown in 27.4 AC Characteristics, and then input a high level. After power is applied, do not
input a high level to the RESET
____________
pin during a period in which the supply voltage is not within the operating range
shown in
27.4 AC Characteristics
.