UPD78F0138 NEC, UPD78F0138 Datasheet - Page 415

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

(2) Low-voltage detection level selection register (LVIS)
Address: FFBFH
Symbol
This register selects the low-voltage detection level.
This register can be set by an 8-bit memory manipulation instruction.
RESET input clears LVIS to 00H.
LVIS
Notes 1. When the detection voltage of the POC circuit is specified as V
Caution Be sure to clear bits 3 to 7 to 0.
LVIS2
Figure 23-3. Format of Low-Voltage Detection Level Selection Register (LVIS)
7
0
0
0
0
0
1
1
1
1
2. This setting is prohibited in (A1) grade products and (A2) grade products.
After reset: 00H
option, do not select V
selected, the POC circuit has priority.
LVIS1
6
0
0
0
1
1
0
0
1
1
CHAPTER 23 LOW-VOLTAGE DETECTOR
LVIS0
R/W
5
0
0
1
0
1
0
1
0
1
User’s Manual U16228EJ2V0UD
LVI4
V
V
V
V
V
V
V
Setting prohibited
LVI0
LVI1
LVI2
LVI3
LVI4
LVI5
LVI6
to V
4
0
(4.3 V ±0.2 V)
(4.1 V ±0.2 V)
(3.9 V ±0.2 V)
(3.7 V ±0.2 V)
(3.5 V ±0.2 V)
(3.3 V ±0.15 V)
(3.1 V ±0.15 V)
LVI6
as the LVI detection voltage. Even if V
3
0
Note 1
Notes 1, 2
Notes 1, 2
Detection level
LVIS2
2
LVIS1
1
POC
= 3.5 V ±0.2 V by a mask
LVIS0
0
LVI4
to V
LVI6
415
are