Datasheet

Section 20 Power-On Reset and Low-Voltage Detection Circuits (Optional)
Rev. 3.00 Mar. 15, 2006 Page 392 of 526
REJ09B0060-0300
C RES
PSS:
LVDCR:
LVDSR:
LVDRES:
LVDINT:
Vreset:
Vint:
Prescaler S
Low-voltage-detection control register
Low-voltage-detection status register
Low-voltage-detection reset signal
Low-voltage-detection interrupt signal
Reset detection voltage
Power-supply fall/rise detection voltage
[Legend]
RES
CK
R
PSS
R
S
Q
OVF
Vreset
Vcc
Vint
LVDRES
LVDCR
LVDSR
LVDINT
Reference
voltage
generator
Noise canceler
Noise canceler
Interrupt
control
circuit
Internal reset
signal
Power-on reset circuit
Low-voltage detection circuit
Internal data bus
Ladder
resistor
+
−
+
−
φ
Interrupt
request
Figure 20.1 Block Diagram of Power-On Reset Circuit and
Low-Voltage Detection Circuit