HD64336901G Renesas Technology, HD64336901G Datasheet - Page 296

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

17.1
Rev. 1.00, 11/03, page 268 of 376
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.
Features
Vcc
BGRE
[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
Step-down circuit
Figure 17.1 Block Diagram around BGR
BGR
VCL
VBGR
VCLSEL
RCSTP
LVDE
LVD (low-voltage
detection circuit)
Internal RC
oscillator