HD64F36024FX Datasheet, PDF (258/386 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 15 Power-On Reset and Low-Voltage Detection Circuits (Optional)
RES
Noise canceler
Noise canceler
φ
CK
PSS
R
OVF
R
Q
S
Power-on reset circuit
Internal reset
signal
Vcc
Ladder
resistor
Vreset
+
−
LVDRES
Vint
+
−
LVDINT
Reference
voltage
generator
Legend
PSS: Prescaler S
LVDCR: Low-voltage-detection control register
LVDSR: Low-voltage-detection status register
LVDRES: Low-voltage-detection reset signal
LVDINT: Low-voltage-detection interrupt signal
Vreset: Reset detection voltage
Vint:
Power-supply fall/rise detection voltage
LVDCR
Interrupt
control
circuit
LVDSR
Interrupt
request
Low-voltage detection circuit
Figure 15.1 Block Diagram of Power-On Reset Circuit and Low-Voltage Detection Circuit
15.2 Register Descriptions
The low-voltage detection circuit has the following registers.
• Low-voltage-detection control register (LVDCR)
• Low-voltage-detection status register (LVDSR)
Rev. 4.00 Sep. 23, 2005 Page 230 of 354
REJ09B0025-0400