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Rev. 1.0, 07/01, page 266 of 372
PSS :
LVDCR :
LVDSR :
Prescaler S
Low-voltage-detection control register
Low-voltage-detection status register
Legend
CK
R
PSS
R
S
Q
OVF
Vreset
Vint
LVDCR
LVDSR
Reference
voltage
Analog-noise
cancellation circuit
Analog-noise
cancellation circuit
Interrupt
control
circuit
Internal reset
signal
Interrupt
request
Internal data bus
Power-
supply
voltage
+
-
+
-
Figure 17-1 Block Diagram of the Power-on Reset Circuit and Low-Voltage Detection
Circuit
17.2 Register Descriptions
The low-voltage detection circuit has the following registers. For details on register addresses and
register states during each process, refer to section 19, Internal I/O Registers.
•
Low-voltage-detection control register (LVDCR)
•
Low-voltage-detection status register (LVDSR)
17.2.1 Low-Voltage-Detection Control Register (LVDCR)
LVDCR is an 8-bit readable/writable register. Settings in this register enable or disable the low-
voltage detection circuit, set the detection levels for the LVDI function, enable or disable
generation of an interrupt when the power-supply voltage rises above or falls below the respective
levels, and enable or disable the LVDR function.