Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38124 Group Only)
Rev. 7.00 Mar 10, 2005 page 437 of 652
REJ09B0042-0700
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 Symbol I/O Function
Low-voltage detection circuit
reference voltage input pin
Vref Input Reference voltage input for low-
voltage detection circuit
Low-voltage detection circuit power
supply drop detection voltage input
pin
extD Input Power supply drop detection voltage
input pin for low-voltage detection
circuit
Low-voltage detection circuit power
supply rise detection voltage input
pin
extU Input 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 76543210
LVDE — VINTDSEL VINTUSEL LVDSEL LVDRE LVDDE LVDUE
Initial value 0
*
0000
*
0
*
00
Read/Write R/W 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.
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