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R8C11 Datasheet(PDF) 38 Page - Renesas Technology Corp

Part # R8C11
Description  16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
PDF  227 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R8C11 Datasheet(HTML) 38 Page - Renesas Technology Corp

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R8C/11 Group
Rev.1.20
Jan 27, 2006
page 27 of 204
REJ09B0062-0120
Figure 5.13 Operation Detection Interrupt Generation Block
Voltage detection interrupt generation circuit
Oscillation stop
detection
interrupt signal
Watchdog timer block
This bit is set to “0”(not detected) by writing a “0” in a program.
D43
D41
CM10
D40
VC27
VCC1
Internal
reference
voltage
+
-
(Canceller width: 200 ns)
VC13
Voltage detection signal
is “H” when VC27 bit= 0
(disabled)
Noise rejection
circuit
Digital
filter
fRING-S
D42
DF1 to DF0
1/2
=002
=012
=102
=112
1/2
1/2
Noise
canceller
Voltage
detection
signal
Watchdog timer
underflow signal
D42 bit is set to “0”(not detected)
by writing a “0” in a program.
When VC27 bit is set to “0”
(voltage detection circuit
disabled), D42 bit is set to “0” .
Voltage detection circuit
Voltage
detection
interrupt signal
Watchdog
timer interrupt
signal
Non-maskable
interrupt signal
D46
Hardware reset 2
D40, D41, D42, D43, DF0, DF1, D46, D47: Bits in D4INT register
CM02: Bit in CM0 register
VC13: Bit in VCR1 register
CM10: Bit in CM1 register
VC27: Bit in VCR2 register
D47
Figure 5.14 Voltage Detection Interrupt Generation Circuit Operation Example
Output of digital filter(2)
D42 bit
D42: Bit in D4INT register
VC13: Bit in VCR1 register
Voltage detection
interrupt signal
No voltage detection interrupt
signals are generated when D42 bit
is “H”.
sampling
Set D42 bit to “0”
in a program (not
detected)
VC13 bit
VCC
sampling
sampling
sampling
Set D42 bit to “0”
in a program (not
detected)
NOTES:
1. D40 is “1”(voltage detection interrupt enabled).
2. Output of the digital filter shown in Figure 5.11
5.4 Voltage Detection Circuit



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