Voltage Detector; Introduction - Renesas M16C/64C User Manual

M16C/64C Group
7.

Voltage Detector

7.1

Introduction

The voltage detector monitors the voltage applied to the VCC1 pin. This circuit can be programmed to
monitor the VCC1 input voltage. Voltage monitor 0 reset, voltage monitor 1 interrupt, voltage monitor 1
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
Voltage to monitor Vdet0
Detection target
VCC1 Voltage to detect
monitor
Monitor
Reset
Process
when
voltage is
detected
Interrupt
Switch
enabled/disabled
Digital
filter
Sampling time
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
Voltage Detector 0
Whether rises through or
falls through Vdet0
Selectable from two levels
in the OFS1 address
None
Voltage monitor 0 reset
Reset when Vdet0 >
VCC1; restart CPU
operation when VCC1 >
Vdet0
None
No digital filter function
−
Voltage Detector 1
Vdet1
Whether rises through or
falls through Vdet1
Selectable from three levels
in the VD1LS register
VW1C3 bit in the VW1C
register
Whether VCC1 is higher or
lower than Vdet1
Voltage monitor 1 reset
Reset when Vdet1 > VCC1;
restart CPU operation after
tps + 60 cycles of fOCO-S
divided by 8
Voltage monitor 1
interrupt
Interrupt request when
Vdet1 > VCC1 and
VCC1 > Vdet1 while
digital filter is enabled;
interrupt request when
Vdet1 > VCC1 or
VCC1 > Vdet1 while
digital filter is disabled
Available
(fOCO-S divided by n)
× 3
n: 1, 2, 4, 8
7. Voltage Detector
Voltage Detector 2
Vdet2
Whether rises through or
falls through Vdet2
Fixed level
VC13 bit in the VCR1
register
Whether VCC1 is higher or
lower than Vdet2
Voltage monitor 2 reset
Reset when Vdet2 > VCC1;
restart CPU operation after
tps + 60 cycles of fOCO-S
divided by 8
Voltage monitor 2
interrupt
Interrupt request when
Vdet2 > VCC1 and
VCC1 > Vdet2 while
digital filter is enabled;
interrupt request when
Vdet2 > VCC1 or
VCC1 > Vdet2 while
digital filter is disabled
Available
(fOCO-S divided by n)
× 3
n: 1, 2, 4, 8
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