Datasheet

78K0/Ix2 CHAPTER 22 LOW-VOLTAGE DETECTOR
R01UH0010EJ0500 Rev.5.00 631
Feb 28, 2012
22.2 Configuration of Low-Voltage Detector
The block diagram of the low-voltage detector is shown in Figure 22-1.
Figure 22-1. Block Diagram of Low-Voltage Detector
LVIS1 LVIS0
LVION
+
Reference
voltage
source
Internal bus
N-ch
Low-voltage detection level
selection register (LVIS)
Low-voltage detection register
(LVIM)
LVIS2
LVIS3
LVIF
INTLVI
Internal reset signal
4
LVIMD
Low-voltage detection
level selector
Selector
V
DD
V
DD
22.3 Registers Controlling Low-Voltage Detector
The low-voltage detector is controlled by the following registers.
Low-voltage detection register (LVIM)
Low-voltage detection level select register (LVIS)
(1) Low-voltage detection register (LVIM)
This register sets low-voltage detection and the operation mode.
This register can be set by a 1-bit or 8-bit memory manipulation instruction.
The generation of a reset signal other than an LVI reset clears this register to 00H.