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R8C/18 Group, R8C/19 Group
VCC
Figure 7.1
Block Diagram of Voltage Detection Circuit
Voltage detection 1 circuit
VCA26
VCC
+
Internal
-
reference
voltage
VW1C0 to VW1C1, VW1F0 to VW1F1, VW1C6, VW1C7: Bits in VW1C register
VCA26: Bit in VCA2 register
Figure 7.2
Block Diagram of Voltage Monitor 1 Reset Generation Circuit
Rev.1.30
Apr 14, 2006
REJ09B0222-0130
VCA27
+
Internal
reference
-
≥ Vdet2
voltage
VCA26
+
-
≥ Vdet1
Voltage monitor 1 reset generation circuit
1/2
fRING-S
Voltage
detection 1
signal
Voltage detection 1
signal is held "H" when
VCA26 bit is set to 0
(disabled).
Page 41 of 233
Noise filter
VW1F1 to VW1F0
= 00b
= 01b
= 10b
= 11b
1/2
1/2
Digital
filter
VW1C1
VW1C7
7. Voltage Detection Circuit
Voltage detection 2
signal
VCA1 register
b3
VCA13 bit
Voltage detection 1
signal
Voltage
monitor 1
reset
signal
VW1C0
VW1C6
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