M16C65 Datasheet, PDF (291/829 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.
15. Watchdog Timer
15.2 Registers
Table 15.2 Register Structure
Address
Register Name
Register Symbol
After Reset
002Ch
Voltage Monitor 2 Circuit Control Register VW2C
1000 0X10b
037Ch
Count Source Protection Mode Register CSPR
00h ⁽¹⁾
037Dh
Watchdog Timer Reset Register
WDTR
XXh
037Eh
Watchdog Timer Start Register
WDTS
XXh
037Fh
Watchdog Timer Control Register
WDC
00XX XXXXb
Note:
1. When the CSPROINI bit in the OFS1 address is 0, the value after reset becomes 1000 0000b.
15.2.1 Voltage Monitor 2 Circuit Control Register (VW2C)
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.
Since rewriting the VW2C register may set the VW2C2 bit to 1, set the VW2C2 bit to 0 after rewriting
the VW2C register.
Bits VW2C2 and VW2C3 do not change at voltage monitor 1 reset, voltage monitor 2 reset, oscillation
stop detection reset, watchdog timer reset, or software reset.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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