Datasheet

78K0/Kx2-L CHAPTER 22 LOW-VOLTAGE DETECTOR
R01UH0028EJ0400 Rev.4.00 680
Sep 27, 2010
(b) When LVI default start function enabled is set (LVISTART = 1)
The setting when operation starts and when operation stops is the same as that described in 22.4.1 (1) When
LVI default start function stopped is set (LVISTART = 0).
Figure 22-6. Timing of Low-Voltage Detector Internal Reset Signal Generation
(Bit: LVISEL = 0, Option Byte: LVISTART = 1)
V LVI
L
Set LVI to be
used for reset
V
LVI = 1.91 V (TYP.)
V
POR = 1.61 V (TYP.)
V
PDR = 1.59 V (TYP.)
Supply voltage (V
DD )
LVIMK flag
(set by software)
LVISEL flag
(set by software)
LVION flag
(set by software)
LVIF flag
LVIMD flag
(set by software)
LVIRF flag
Note 3
Internal reset signal
LVI reset signal
POC reset signal
Time
Cleared
Cleared
Cleared
Not cleared
Not cleared
Not cleared
Not cleared
Cleared by
software
Cleared by
software
H
Note 1
<5> Wait time
Note 2
<6>
<7>
<3>
<4>
<2>
<1>
Notes 1. The LVIMK flag is set to “1” by reset signal generation.
2. The LVIIF flag of the interrupt request flag registers and the LVIF flag may be set (1).
3. LVIRF is bit 0 of the reset control flag register (RESF).
For details of RESF, refer to CHAPTER 20 RESET FUNCTION.
Remarks 1. <1> to <7> in Figure 22-6 above correspond to <1> to <7> in the description of “When starting
operation” in 22.4.1 (1) (a) When LVI default start function stopped is set (LVISTART = 0).
2. V
POR: POC power supply rise detection voltage
V
PDR: POC power supply fall detection voltage
<R>
<R>