HD64F38024HV Datasheet, PDF (455/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38124 Group Only)
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
Symbol
Vref
extD
extU
I/O
Input
Input
Input
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
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
Symbol
R/W
Initial Value Address
Low-voltage detection control register LVDCR
R/W
H'00
H'FF86
Low-voltage detection status register LVDSR
R/W
H'00
H'FF87
Low-voltage detection counter
LVDCNT
R
H'00
H'FFC3
14.2 Individual Register Descriptions
14.2.1 Low-Voltage Detection Control Register (LVDCR)
Bit
Initial value
Read/Write
7
LVDE
0^*
R/W
6
5
4
3
2
1
0
— VINTDSEL VINTUSEL LVDSEL LVDRE LVDDE LVDUE
0
0
0
0^*
0^*
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Note: * These bits are not initialized by resets trigged by LVDR. They are initialized by power-on
resets and watchdog timer resets.
Rev. 8.00 Mar. 09, 2010 Page 433 of 658
REJ09B0042-0800