M16C65 Datasheet, PDF (118/829 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.
7.2.6 Voltage Monitor 1 Circuit Control Register (VW1C)
7. Voltage Detector
Voltage Monitor 1 Circuit Control Register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
VW1C
Bit Symbol
Address
002Bh
Bit Name
After Reset
1000 XX10b(hardware reset,
power-on reset,
voltage monitor 0 reset)
Function
RW
VW1C0
Voltage monitor 1 interrupt/
reset enable bit
0 : Disabled
1 : Enabled
RW
VW1C1
Voltage monitor 1 digital filter 0 : Enable digital filter
disable mode select bit
1 : Disable digital filter
RW
VW1C2
Voltage change detection
flag
0 : Not detected
1 : Vdet1 passage detected
RW
VW1C3
Voltage detection 1 signal
monitor flag
0 : VCC1 < Vdet1
1 : VCC1 ≥ Vdet1
or voltage detection 1 circuit disabled
RO
VW1F0
b5 b4
0 0 : fOCO-S divided by 1
Sampling clock select bit
0 1 : fOCO-S divided by 2
RW
VW1F1
1 0 : fOCO-S divided by 4
1 1 : fOCO-S divided by 8
VW1C6
Voltage monitor 1 circuit
mode select bit
0 : Voltage monitor 1 interrupt at Vdet1 passage
1 : Voltage monitor 1 reset at Vdet1 passage
RW
VW1C7
Voltage monitor 1 interrupt/
reset generation condition
select bit
0 : When VCC1 reaches Vdet1 or above
1 : When VCC1 reaches Vdet1 or below
RW
Set the PRC3 bit in the PRCR register to 1 (write enabled) before writing to the VW1C register.
The VW1C2 bit may become 1 when the VW1C register is rewritten. Therefore, set the VW1C2 bit to 0
after rewriting the VW1C register.
VW1C0 (Voltage Monitor 1 Interrupt/Reset Enable Bit) (b0)
The VW1C0 bit is enabled when the VW12E bit in the VWCE register is 1 (voltage detection 1 and 2
circuits enabled) and the VC26 bit in the VCR2 register is 1 (voltage detection 1 circuit enabled). Set
the VW1C0 bit to 0 (disabled) when the VC26 bit is 0 (voltage detection 1 circuit disabled).
VW1C1 (Voltage Monitor 1 Digital Filter Disable Mode Select Bit) (b1)
After using the voltage monitor 1 interrupt to exit stop mode, to use it again to exit stop mode, set the
VW1C1 bit to 0 first, and then to 1.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 83 of 791