Voltage Detector 1 - Renesas M16C/64A Series User Manual

M16C/64A Group
7.4.3

Voltage Detector 1

When the VW12E bit in the VWCE register is 1 (voltage monitors 1 and 2 enabled) and the VC26 bit in
the VCR2 register is 1 (voltage detector 1 enabled), voltage detector 1 monitors the voltage applied to
the VCC1 pin and detects whether the voltage rises through or falls through Vdet1.
Voltage detector 1
level selector
VCC1
VD1LS3 to
VD1LS0
Internal reference
voltage
The voltage detector 1 signal
becomes high when the VC26 bit is
set to 0 (disabled).
VW1C0 to VW1C3, VW1F0 to VW1F1, VW1C6 to VW1C7: Bits in the VW1C register
VC26: Bit in the VCR2 register
VD1LS3 to VD1LS0: Bit in the VD1LS register
Figure 7.5 Voltage Monitor 1 Interrupt/Reset Generator
7.4.3.1 Monitoring Vdet1
Set the VW12E bit in the VWCE register to 1 (voltage monitors 1 and 2 enabled) and the VC26 bit in
the VCR2 register to 1 (voltage detector 1 enabled). Vdet1 can be monitored by using the VW1C3 bit
in the VW1C register after td(E-A) elapses.
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
Voltage monitor 1 interrupt/reset generator
fOCO-S
VC26
VW1C3
+
Voltage
-
detector
1 signal
VW1C7
VW1F1 and VW1F0
00b
01b
10b
11b
1/2 1/2 1/2
VW1C1
Digital
0 VW1C2
filter
VW1C1
1
VW1C6
VW1C0
7. Voltage Detector
Watchdog timer
interrupt signal
Voltage monitor
1 interrupt signal
Non-maskable
Voltage monitor
interrupt signal
2 interrupt signal
Oscillator stop detect
interrupt signal
Voltage monitor 1 reset signal
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