HD6433682 ETC, HD6433682 Datasheet - Page 372

• Manufacturer Part Number: HD6433682
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
• Manufacturer: ETC

20.2
The low-voltage detection circuit has the following registers.
20.2.1
LVDCR is used to enable or disable the low-voltage detection circuit, set the detection levels for
the LVDR function, enable or disable the LVDR function, and enable or disable generation of an
interrupt when the power-supply voltage rises above or falls below the respective levels.
Table 20.1 shows the relationship between the LVDCR settings and select functions. LVDCR
should be set according to table 20.1.
Rev. 3.00, 05/03, page 342 of 472
Figure 20.1 Block Diagram of Power-On Reset Circuit and Low-Voltage Detection Circuit
Vcc
Low-voltage-detection control register (LVDCR)
Low-voltage-detection status register (LVDSR)
Legend
PSS:
LVDCR:
LVDSR:
Vreset:
Vint:
Register Descriptions
Low-Voltage-Detection Control Register (LVDCR)
Ladder
resistor
:
:
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
Vint
Vreset
Reference
voltage
generator
Noise canceler
Noise canceler
+
+
Interrupt
control
circuit
CK
R
PSS
Low-voltage detection circuit
Power-on reset circuit
OVF
LVDCR
LVDSR
R
S
Q
Interrupt
request
Internal reset
signal