HD64336900G Datasheet, PDF (296/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

17.1 Features
• BGR circuit
Supplies stable reference voltage covering the entire operating voltage range and the operating
temperature range.
Reduces power consumption when BGR is disabled by setting registers.
• Power-on reset circuit
Uses an external capacitor to generate an internal reset signal when power is first supplied.
• Low-voltage detection circuit
LVDR: Monitors the power-supply voltage, and generates an internal reset signal when the
voltage falls below a given value.
LVDI: Monitors the power-supply voltage, and generates an interrupt when the voltage falls
below or rises above respective given values.
Two detection levels for reset generation voltage are available: when only the LVDR circuit is
used, or when the LVDI and LVDR circuits are both used.
VCLSEL
Vcc
VCL
Step-down circuit
BGRE
BGR
VBGR
RCSTP
Internal RC
oscillator
LVDE
LVD (low-voltage
detection circuit)
[Legend]
Vcc:
BGRE:
VCL:
VBGR:
VCLSEL:
RCSTP:
LVDE:
Power supply
BGR circuit enable signal
Internal power supply generated from Vcc by the step-down circuit
Reference voltage from BGR
Select signal for the source of the RC oscillator power supply
RC oscillator stop signal
LVD enable signal
Figure 17.1 Block Diagram around BGR
Rev. 1.00, 11/03, page 268 of 376