M16C65 Datasheet, PDF (120/829 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.
7.2.7 Voltage Monitor 2 Circuit Control Register (VW2C)
7. Voltage Detector
Voltage Monitor 2 Circuit Control Register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
VW2C
Bit Symbol
Address
002Ch
Bit Name
After Reset
1000 0X10b(hardware reset,
power-on reset,
voltage monitor 0 reset)
Function
RW
VW2C0
Voltage monitor 2 interrupt/
reset enable bit
0 : Disabled
1 : Enabled
RW
VW2C1
Voltage monitor 2 digital filter 0 : Enable digital filter
disable mode select bit
1 : Disable digital filter
RW
VW2C2
Voltage change detection
flag
0 : Not detected
1 : Vdet2 passage detected
RW
VW2C3 WDT detection flag
0 : Not detected
1 : Watchdog timer underflow detected
RW
VW2F0
b5 b4
0 0 : fOCO-S divided by 1
Sampling clock select bit
0 1 : fOCO-S divided by 2
RW
VW2F1
1 0 : fOCO-S divided by 4
1 1 : fOCO-S divided by 8
VW2C6
Voltage monitor 2 circuit
mode select bit
0 : Voltage monitor 2 interrupt at Vdet2 passage
1 : Voltage monitor 2 reset at Vdet2 passage
RW
VW2C7
Voltage monitor 2 interrupt/
reset generation condition
select bit
0 : When VCC1 reaches Vdet2 or above
1 : When VCC1 reaches Vdet2 or below
RW
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VW2C register.
When rewriting the VW2C register, the VW2C2 bit may become 1. Set the VW2C2 bit to 0 after
rewriting the VW2C register.
The VW2C3 bit does not change at voltage monitor 1 reset, voltage monitor 2 reset, oscillation stop
detection reset, watchdog timer reset, or software reset.
VW2C0 (Voltage Monitor 2 Interrupt/Reset Enable Bit) (b0)
The VW2C0 bit is enabled 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). Set
the VW2C0 bit to 0 (disabled) when the VC27 bit is 0 (voltage detection 2 circuit disabled).
VW2C1 (Voltage Monitor 2 Digital Filter Disable Mode Select Bit) (b1)
After using the voltage monitor 2 interrupt to exit stop mode, to use it again to exit stop mode, set the
VW2C1 bit to 0 first and then to 1.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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