H8SSLASH2225 datasheet(56/1071 Pages) RENESAS

56 / 1071 page

Rev. 5.00 Aug 08, 2006 page lvi of lxxxvi

12.5 Operation Timing.............................................................................................................. 453

12.5.1 TCNT Incrementation Timing ............................................................................. 453

12.5.2 Timing of CMFA and CMFB Setting when a Compare-Match Occurs............... 454

12.5.3 Timing of Timer Output when a Compare-Match Occurs ................................... 455

12.5.4 Timing of Compare-Match Clear when a Compare-Match Occurs ..................... 455

12.5.5 TCNT External Reset Timing .............................................................................. 456

12.5.6 Timing of Overflow Flag (OVF) Setting ............................................................. 456

12.6 Operation with Cascaded Connection ............................................................................... 457

12.6.1 16-Bit Count Mode .............................................................................................. 457

12.6.2 Compare-Match Count Mode .............................................................................. 457

12.7 Interrupt Sources............................................................................................................... 458

12.7.1 Interrupt Sources and DTC Activation ................................................................ 458

12.7.2 A/D Converter Activation.................................................................................... 458

12.8 Usage Notes ...................................................................................................................... 459

12.8.1 Contention between TCNT Write and Clear........................................................ 459

12.8.2 Contention between TCNT Write and Increment ................................................ 459

12.8.3 Contention between TCOR Write and Compare-Match ...................................... 460

12.8.4 Contention between Compare-Matches A and B................................................. 461

12.8.5 Switching of Internal Clocks and TCNT Operation............................................. 461

12.8.6 Contention between Interrupts and Module Stop Mode ...................................... 463

12.8.7 Mode Setting of Cascaded Connection ................................................................ 463

Section 13 Watchdog Timer (WDT).............................................................................. 465

13.1 Features............................................................................................................................. 465

13.2 Input/Output Pins .............................................................................................................. 467

13.3 Register Descriptions ........................................................................................................ 467

13.3.1 Timer Counter (TCNT)........................................................................................ 468

13.3.2 Timer Control/Status Register (TCSR)................................................................ 468

13.3.3 Reset Control/Status Register (RSTCSR) (only WDT_0) ................................... 472

13.4 Operation .......................................................................................................................... 473

13.4.1 Watchdog Timer Mode ........................................................................................ 473

13.4.2 Interval Timer Mode............................................................................................ 474

13.4.3 Timing of Setting Overflow Flag (OVF) ............................................................. 475

13.4.4 Timing of Setting Watchdog Timer Overflow Flag (WOVF) ............................. 476

13.5 Interrupt Sources............................................................................................................... 476

13.6 Usage Notes ...................................................................................................................... 477

13.6.1 Notes on Register Access..................................................................................... 477

13.6.2 Contention between Timer Counter (TCNT) Write and Increment ..................... 478

13.6.3 Changing Value of CKS2 to CKS0...................................................................... 479

13.6.4 Switching between Watchdog Timer Mode and Interval Timer Mode................ 479

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