M16C65 Datasheet, PDF (129/829 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
7.4.4 Voltage Detection 2 Circuit
When the VW12E bit in the VWCE register is 1 (voltage detection 1 and 2 circuits enabled) and the
VC27 bit in the VCR2 register is 1 (voltage detection 2 circuit enabled), the voltage detection 2 circuit
monitors the voltage applied to the VCC1 pin and detects whether the voltage passes Vdet2 by rising or
falling.
Voltage monitor 2 interrupt/reset generator
Voltage detection 2 circuit _fOCO-S
VC27
VW2F1 to VW2F0
00b
01b
10b
1/2 1/2 1/2 ^11b
VC13
VCC1 +
Internal
reference ^-
voltage
Voltage
detection
2 signal
Digital
filter
The voltage detection 2 signal ^VW2C7
becomes high level when the
VC27 bit is set to 0 (disabled).
0 ^{VW2C1 VW2C2}
1
VW2C0
VW2C6
Watchdog timer
interrupt signal
Voltage monitor
1 interrupt signal
Voltage monitor
2 interrupt signal Non-maskable
interrupt signal
Oscillation stop
detection
interrupt signal
Voltage monitor 2 reset signal
VW2C0 to VW2C2, VW2F0 to VW2F1, VW2C6 to VW2C7 : Bits in the VW2C register
VC13 : Bit in the VCR1 register
VC27 : Bit in the VCR2 register
Figure 7.7 Voltage Monitor 2 Interrupt/Reset Generator
7.4.4.1 Monitoring Vdet2
Set the VW12E bit in the VWCE register to 1 (voltage detection 1 and 2 circuits enabled) and the
VC27 bit in the VCR2 register to 1 (voltage detection 2 circuit enabled). Vdet2 can be monitored by
using the VCA13 bit in the VCA1 register after td(E-A) elapses.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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