M16C65 Datasheet, PDF (110/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
7. Voltage Detector
7. Voltage Detector
7.1 Introduction
The voltage detection circuit monitors the voltage applied to the VCC1 pin. This circuit can be
programmed to monitor the VCC1 input voltage. Alternately, 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 Detection Circuit.
Table 7.1 Voltage Detector Specifications
VCC1
monitor
Process
when
voltage is
detected
Digital
filter
Item
Voltage Detection 0
Voltage to monitor Vdet0
Detection target
Whether passing Vdet0
by rising or falling
Monitor
None
Reset
Interrupt
Voltage monitor 0 reset
Reset at Vdet0 > VCC1;
restart CPU operation at
VCC1 > Vdet0
None
Switch enabled/
disabled
Sampling time
Available
(Divide-by-n of fOCO-S)
×3
n: 1, 2, 4, 8
Voltage Detection 1
Vdet1
Whether passing Vdet1
by rising or falling
VW1C3 bit in VW1C
register
Whether VCC1 is higher
or lower than Vdet1
Voltage monitor 1 reset
Reset at Vdet1 > VCC1;
restart CPU operation
after a specified time
Voltage monitor 1
interrupt
Interrupt request at
Vdet1 > VCC1 and
VCC1 > Vdet1 when
digital filter is enabled;
interrupt request at
Vdet1 > VCC1 or
VCC1 > Vdet1 when
digital filter is disabled
Available
(Divide-by-n of fOCO-S)
×3
n: 1, 2, 4, 8
Voltage Detection 2
Vdet2
Whether passing Vdet2
by rising or falling
VC13 bit in VCR1 register
Whether VCC1 is higher
or lower than Vdet2
Voltage monitor 2 reset
Reset at Vdet2 > VCC1;
restart CPU operation
after a specified time
Voltage monitor 2
interrupt
Interrupt request at
Vdet2 > VCC1 and
VCC1 > Vdet2 when
digital filter is enabled;
interrupt request at
Vdet2 > VCC1 or
VCC1 > Vdet2 when
digital filter is disabled
Available
(Divide-by-n of fOCO-S)
×3
n: 1, 2, 4, 8
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 75 of 791