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M16C/5L Group, M16C/56 Group
7.
Voltage Detector
7.1
Introduction
The voltage detector monitors the voltage applied to the VCC pin. This circuit can be programmed to
monitor the VCC input voltage. Voltage monitor 0 reset, voltage monitor 2 interrupt, and voltage monitor 2
reset can also be used.
Table 7.1 lists the Voltage Detector Specifications and Figure 7.1 shows Voltage Detector Block Diagram.
Table 7.1
Voltage Detector Specifications
Item
VCC
Voltage to monitor
monitor
Detection target
Monitor
Process
Reset
when
voltage is
detected
Interrupt
Digital
Switch
filter
enabled/disabled
Sampling time
VCC
reference
Figure 7.1
Voltage Detector Block Diagram
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
Voltage Detector 0
Vdet0
Whether passing Vdet0 by rising or falling Whether passing Vdet2 by rising or falling
None
Voltage monitor 0 reset
Reset at Vdet0 > VCC; restart CPU
operation at VCC > Vdet0
None
None
None
VC27
+
Internal
-
≥
Vdet2
voltage
VC25
+
-
≥
Vdet0
7. Voltage Detector
Voltage Detector 2
Vdet2
VC13 bit in VCR1 register
Whether VCC is higher or lower than
Vdet2
Voltage monitor 2 reset
Reset at Vdet2 > VCC; restart CPU
operation after a specified time
Voltage monitor 2
interrupt
Interrupt request at
Vdet2 > VCC and
VCC > Vdet2 when
digital filter is enabled;
interrupt request at
Vdet2 > VCC or
VCC > Vdet2 when
digital filter is disabled
Available
(Divide-by-n of fOCO-S) × 3
n: 1, 2, 4, 8
Voltage detector 2 signal
VC13 bit in
the VCR1 register
Voltage detector 0 signal
Page 73 of 803
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