HD6473847RHV Datasheet, PDF (379/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38104 Group Only)
14.2 Register Descriptions
The low-voltage detection circuit has the following registers.
• Low-voltage-detection control register (LVDCR)
• Low-voltage-detection status register (LVDSR)
• Low-voltage detection counter (LVDCNT)
14.2.1 Low-Voltage Detection Control Register (LVDCR)
LVDCR is used to control whether or not the low-voltage detection circuit is used, settings for
external input of power supply drop and rise detection voltages, the LVDR detection level setting,
enabling or disabling of resets triggered by the low-voltage detection reset circuit (LVDR), and
enabling or disabling of interrupts triggered by power supply voltage drops or rises.
Table 14.1 shows the relationship between LVDCR settings and function selections. Refer to table
14.1 when making settings to LVDCR.
Initial
Bit Bit Name Value R/W Description
7
LVDE
0^*
R/W LVD Enable
0: Low-voltage detection circuit not used (standby status)
1: Low-voltage detection circuit used
6
⎯
0
R/W This bit is reserved.
5
VINTDSEL 0
R/W Power Supply Drop (LVDD) Detection Level External
Input Select
0: LVDD detection level generated by on-chip ladder
resistor
1: LVDD detection level input to extD pin
4
VINTUSEL 0
R/W Power Supply Rise (LVDU) Detection Level External
Input Select
0: LVDU detection level generated by on-chip ladder
resistor
1: LVDU detection level input to extU pin
Rev. 7.00 Mar. 08, 2010 Page 347 of 510
REJ09B0024-0700