Pin Description; Register Descriptions; Individual Register Descriptions; Low-Voltage Detection Control Register (Lvdcr) - Renesas H8/38024 Hardware Manual

14.1.3

Pin Description

The pins of the power-on reset circuit and low-voltage detection circuit are listed in table 14.1.
Table 14.1 Pin Description
Pin
Low-voltage detection circuit
reference voltage input pin
Low-voltage detection circuit power
supply drop detection voltage input
pin
Low-voltage detection circuit power
supply rise detection voltage input
pin
14.1.4

Register Descriptions

The registers of the power-on reset circuit and low-voltage detection circuit are listed in table 14.2.
Table 14.2 Register Descriptions
Name
Low-voltage detection control register
Low-voltage detection status register
Low-voltage detection counter
14.2

Individual Register Descriptions

14.2.1

Low-Voltage Detection Control Register (LVDCR)

Bit 7
LVDE
0 *
Initial value
Read/Write R/W
Note: * These bits are not initialized by resets trigged by LVDR. They are initialized by power-on
resets and watchdog timer resets.
LVDCR is an 8-bit read/write register. It is used to control whether or not the low-voltage
detection circuit is used, settings for external input of power supply rise and drop detection
Symbol I/O
Vref Input
extD Input
extU Input
Symbol
LVDCR
LVDSR
LVDCNT
6 5
—
VINTDSEL VINTUSEL
0 0
R/W R/W R/W
Function
Reference voltage input for low-
voltage detection circuit
Power supply drop detection voltage
input pin for low-voltage detection
circuit
Power supply rise detection voltage
input pin for low-voltage detection
circuit
R/W Initial Value
R/W H'00
R/W H'00
R H'00
4 3 2
LVDSEL LVDRE
0 * 0 *
0
R/W R/W
Rev. 6.00, 08/04, page 425 of 628
Address
H'FF86
H'FF87
H'FFC3
1 0
LVDDE LVDUE
0 0
R/W R/W