![](http://datasheet.mmic.net.cn/Renesas-Electronics-America/DS72612RP80FPV_datasheet_97110/DS72612RP80FPV_19.png)
R01UH0025EJ0300 Rev. 3.00
Page xix of xxxii
Sep 24, 2010
13.6.1
16-Bit Counter Mode ........................................................................................ 621
13.6.2
Compare Match Count Mode............................................................................ 621
13.7
Interrupt Sources............................................................................................................... 622
13.7.1
Interrupt Sources............................................................................................... 622
13.7.2
A/D Converter Activation................................................................................. 622
13.8
Usage Notes ...................................................................................................................... 623
13.8.1
Notes on Setting Cycle...................................................................................... 623
13.8.2
Conflict between TCNT Write and Clear ......................................................... 623
13.8.3
Conflict between TCNT Write and Increment.................................................. 624
13.8.4
Conflict between TCOR Write and Compare Match ........................................ 624
13.8.5
Conflict between Compare Matches A and B................................................... 625
13.8.6
Switching of Internal Clocks and TCNT Operation.......................................... 625
13.8.7
Mode Setting with Cascaded Connection ......................................................... 627
13.8.8
Module Standby Setting.................................................................................... 627
13.8.9
Interrupts in Module Standby Mode ................................................................. 627
Section 14 Watchdog Timer (WDT)..................................................................629
14.1
Features............................................................................................................................. 629
14.2
Input/Output Pin ............................................................................................................... 630
14.3
Register Descriptions ........................................................................................................ 631
14.3.1
Watchdog Timer Counter (WTCNT)................................................................ 631
14.3.2
Watchdog Timer Control/Status Register (WTCSR) ........................................ 632
14.3.3
Watchdog Reset Control/Status Register (WRCSR) ........................................ 634
14.3.4
Notes on Register Access.................................................................................. 635
14.4
WDT Usage ...................................................................................................................... 637
14.4.1
Canceling Software Standby Mode................................................................... 637
14.4.2
Changing the Frequency ................................................................................... 637
14.4.3
Using Watchdog Timer Mode........................................................................... 638
14.4.4
Using Interval Timer Mode............................................................................... 639
14.5
Usage Notes ...................................................................................................................... 640
14.5.1
Timer Variation................................................................................................. 640
14.5.2
Prohibition against Setting H'FF to WTCNT.................................................... 640
14.5.3
Interval Timer Overflow Flag ........................................................................... 640
14.5.4
System Reset by
WDTOVF Signal................................................................... 641
14.5.5
Manual Reset in Watchdog Timer Mode .......................................................... 641
Section 15 Realtime Clock (RTC) .....................................................................643
15.1
Features............................................................................................................................. 643
15.2
Input/Output Pin ............................................................................................................... 645
15.3
Register Descriptions ........................................................................................................ 645