UPD78F0138 NEC, UPD78F0138 Datasheet - Page 412

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

412
23.1 Functions of Low-Voltage Detector
reset occurs. For details of RESF, refer to CHAPTER 20 RESET FUNCTION.
23.2 Configuration of Low-Voltage Detector
The low-voltage detector (LVI) has following functions.
• Compares supply voltage (V
• Detection levels (seven levels)
• Interrupt or reset function can be selected by software.
• Operable in STOP mode.
Note Five levels in the case of (A1) grade products and (A2) grade products.
When the low-voltage detector is used to reset, bit 0 (LVIRF) of the reset control flag register (RESF) is set to 1 if
The block diagram of the low-voltage detector is shown below.
V
internal reset signal when V
DD
Low-voltage detection level
selection register (LVIS)
Figure 23-1. Block Diagram of Low-Voltage Detector
DD
DD
voltage source
Note
< V
) and detection voltage (V
Detection
of supply voltage can be changed by software.
LVI
(V
LVI
.
CHAPTER 23 LOW-VOLTAGE DETECTOR
N-ch
)
Internal bus
+
User’s Manual U16228EJ2V0UD
V
DD
LVI
), and generates an internal interrupt signal or
Low-voltage detection register
(LVIM)
INTLVI
Internal reset signal