Registers - NEC V850ES/F 3-L Series User Manual

Chapter 22
V
DD
Figure 22-1

22.3 Registers

(1)
714
Low
N-ch
voltage
detection
level
selector
Reference voltage
source (V
Low voltage detection level
selection register (LVIS)
Internal bus
Block diagram of Low-Voltage Detector
The Low-Voltage Detector is controlled by the following registers.
• Low voltage detection register (LVIM)
• Low voltage detection level selection register (LVIS)
LVIM - Low voltage detection register
This register is a special register and can be written only in a combination of
specific sequences (refer to "Write Protected Registers" on page 155).
The LVIM register is used to enable or disable low voltage detection, and to set
the operation mode of the Low-Voltage Detector.
This register can be read or written in 8-bit or 1-bit units.
Reset input clears this register to 00H.
After reset: 00H R/W
7
LVIM LVION
LVION Low voltage detection operation enable or disable
0 Disable operation.
1 Enable operation.
User's Manual U18743EE1V2UM00
V
DD
+
−
)
LVI
Address: FFFFF890H
6 5 4
0 0 0
Low-Voltage Detector
Internal reset signal
INTLVIH
INTLVIL
Low voltage detection
register (LVIM)
3 2 1
0 0 LVIMD
0
LVIF