Renesas R8C/20 User Manual

R8C/20 Group, R8C/21 Group 6. Voltage Detection Circuit
Rev.2.00 Aug 27, 2008 Page 30 of 458
REJ09B0250-0200
Figure 6.3 Block Diagram of Voltage Monitor 2 Interrupt/Reset Generation Circuit
+
-
1/2 1/2 1/2
Voltage detection 2 circuit
VCA27
VCC
Internal
reference
voltage
VCA13
Noise filter
(Filter width: 200ns)
Voltage detection 2 signal
is held “H” when VCA27 bit
is set to 0 (disabled)
Voltage
detection
2 signal
fOCO-S
VW2F1 to VW2F0
= 00b
= 01b
= 10b
= 11b
VW2C1
VW2C2 bit is set to 0 (not detected) by
writing 0 by program.
When VCA27 bit is set to 0 (voltage
detection 2 circuit disabled), VW2C2
bit is set to 0
VW2C7
VW2C3
Watchdog timer block
Watchdog timer underflow
signal
This bit is set to 0 (not detected) by writing
“0” by program.
Voltage monitor 2 interrupt/reset generation circuit
VW2C0 to VW2C3, VW2F2, VW2F1, VW2C6, VW2C7: Bits in VW2C register
VCA13: Bit in VCA1 register
VCA27: Bit in VCA2 register
VW2C2
VW2C0
VW2C6
Voltage
monitor 2
reset signal
Non-maskable
interrupt signal
Voltage monitor 2
interrupt signal
Watchdog timer
interrupt signal
Oscillation stop
detection
interrupt signal
VW2C1
Digital
filter

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English