UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 577

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

22.1 Functions of Low-Voltage Detector
pin is more than or less than the detection level can be checked by reading the low-voltage detection flag (LVIF: bit 0
of LVIM).
reset occurs. For details of RESF, see CHAPTER 19 RESET FUNCTION.
Selects reset (LVIMD = 1).
Generates an internal reset
signal when V
releases the reset signal when
V
DD
The low-voltage detector (LVI) has the following functions.
• The LVI circuit compares the supply voltage (V
• The supply voltage (V
• Reset or interrupt function can be selected by software.
• Detection levels (16 levels) of supply voltage can be changed by software.
• Operable in STOP mode.
The reset and interrupt signals are generated as follows depending on selection by software.
Remark LVISEL: Bit 2 of low-voltage detection register (LVIM)
While the low-voltage detector is operating, whether the supply voltage or the input voltage from an external input
When the low-voltage detector is used to reset, bit 0 (LVIRF) of the reset control flag register (RESF) is set to 1 if
≥ V
external input pin (EXLVI) with the detection voltage (V
reset or internal interrupt signal.
Selection of Level Detection of Supply Voltage (V
LVI
.
DD
LVIMD: Bit 1 of LVIM
< V
LVI
and
(LVISEL = 0)
DD
) or input voltage from an external input pin (EXLVI) can be selected by software.
Selects interrupt (LVIMD = 0).
Generates an internal interrupt
signal when V
than V
V
(V
DD
DD
CHAPTER 22 LOW-VOLTAGE DETECTOR
becomes V
≥ V
LVI
LVI
(V
).
DD
DD
< V
LVI
drops lower
User’s Manual U17554EJ4V0UD
LVI
or higher
) or when
DD
)
DD
) with the detection voltage (V
Selects reset (LVIMD = 1).
Generates an internal reset
signal when EXLVI < V
and releases the reset signal
when EXLVI ≥ V
EXLVI
= 1.21 V (TYP.): fixed), and generates an internal
Selection Level Detection of Input Voltage from
External Input Pin (EXLVI) (LVISEL = 1)
EXLVI
.
EXLVI
LVI
) or the input voltage from an
Selects interrupt (LVIMD = 0).
Generates an internal interrupt
signal when EXLVI drops
lower than V
V
becomes V
(EXLVI ≥ V
EXLVI
) or when EXLVI
EXLVI
EXLVI
EXLVI
).
or higher
(EXLVI <
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