Block Diagram - Renesas H8/38024 Hardware Manual

14.1.2

Block Diagram

A block diagram of the power-on reset circuit and low-voltage detection circuit are shown in
figure 14.1.
RES
Vcc
External
power
supply
extD
External
ladder
extU
resistor
Vref
External
reference voltage
generator
[Legend]
PSS:
LVDCR:
LVDSR:
LVDRES:
LVDINT:
Vreset:
Vint:
extD:
extU:
Vref:
Figure 14.1 Diagram of Power-On Reset Circuit and Low-Voltage Detection Circuit
Rev. 6.00, 08/04, page 424 of 628
Noise
canceler
Noise
canceler
Vreset
Ladder
resistor
Vint
On-chip
reference voltage
generator
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
Power supply drop detection voltage input pin
Power supply rise detection voltage input pin
Reference voltage input pin
φ
CK
PSS
R
+
−
LVDRES
+
Interrupt
−
control
LVDINT
circuit
Low-voltage detection circuit
OVF
R
Internal reset
Q
signal
S
Power-on reset circuit
LVDCR
LVDSR
Interrupt
request