CHAPTER 17 LOW-VOLTAGE DETECTOR
Preliminary User’s Manual U19014EJ1V0UD
441
Figure 17-5. Timing of Low-Voltage Detector Internal Reset Signal Generation
(Detects Level of Supply Voltage (V
DD
))
In 2.7 V/1.59 V POC mode (option byte: POCMODE = 1)
Supply voltage (V
DD
)
V
LVI
<2>
<1>
Time
LVIMK flag
(set by software)
LVIF flag
LVIRF flag
Note 3
Note 2
LVI reset signal
POC reset signal
Internal reset signal
Cleared by
software
Not cleared
Not cleared
Not cleared
Not cleared
Cleared by
software
<3>
<6>
Clear
Clear
Clear
<4> Wait time
LVION flag
(set by software)
LVIMD flag
(set by software)
H
Note 1
<5>
2.7 V (TYP.)
V
POC
= 1.59 V (TYP.)
Notes 1.
The LVIMK flag is set to “1” by reset signal generation.
2.
The LVIF flag may be set (1).
3.
LVIRF is bit 0 of the reset control flag register (RESF). For details of RESF, see
CHAPTER 15 RESET
FUNCTION
.
Remarks 1.
<1> to <6> in Figure 17-5 above correspond to <1> to <6> in the description of “When starting
operation”
in
17.4.1 (1) When detecting level of supply voltage (V
DD
)
.
2.
For
the
µ
PD78F0730, be sure to set the 2.7 V/1.59 V POC mode by using the option byte
(POCMODE = 1).
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