HD64F2168 Datasheet, PDF (17/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

12.9 Usage Notes ...................................................................................................................... 330
12.9.1 Conflict between TCNT Write and Counter Clear............................................... 330
12.9.2 Conflict between TCNT Write and Increment..................................................... 331
12.9.3 Conflict between TCOR Write and Compare-Match........................................... 332
12.9.4 Conflict between Compare-Matches A and B ..................................................... 333
12.9.5 Switching of Internal Clocks and TCNT Operation............................................. 333
12.9.6 Mode Setting with Cascaded Connection ............................................................ 335
Section 13 Watchdog Timer (WDT)..................................................................337
13.1 Features............................................................................................................................. 337
13.2 Input/Output Pins .............................................................................................................. 339
13.3 Register Descriptions ........................................................................................................ 340
13.3.1 Timer Counter (TCNT)........................................................................................ 340
13.3.2 Timer Control/Status Register (TCSR)................................................................ 340
13.4 Operation .......................................................................................................................... 344
13.4.1 Watchdog Timer Mode ........................................................................................ 344
13.4.2 Interval Timer Mode............................................................................................ 345
13.4.3 RESO Signal Output Timing ............................................................................... 346
13.5 Interrupt Sources............................................................................................................... 347
13.6 Usage Notes ...................................................................................................................... 348
13.6.1 Notes on Register Access..................................................................................... 348
13.6.2 Conflict between Timer Counter (TCNT) Write and Increment.......................... 349
13.6.3 Changing Values of CKS2 to CKS0 Bits............................................................. 349
13.6.4 Changing Value of PSS Bit.................................................................................. 349
13.6.5 Switching between Watchdog Timer Mode and Interval Timer Mode................ 350
13.6.6 System Reset by RESO Signal ............................................................................ 350
Section 14 Serial Communication Interface (SCI, IrDA, and CRC) ................351
14.1 Features............................................................................................................................. 351
14.2 Input/Output Pins .............................................................................................................. 355
14.3 Register Descriptions ........................................................................................................ 356
14.3.1 Receive Shift Register (RSR) .............................................................................. 356
14.3.2 Receive Data Register (RDR) .............................................................................. 356
14.3.3 Transmit Data Register (TDR)............................................................................. 357
14.3.4 Transmit Shift Register (TSR) ............................................................................. 357
14.3.5 Serial Mode Register (SMR) ............................................................................... 357
14.3.6 Serial Control Register (SCR) ............................................................................. 361
14.3.7 Serial Status Register (SSR) ................................................................................ 364
14.3.8 Smart Card Mode Register (SCMR).................................................................... 368
14.3.9 Bit Rate Register (BRR) ...................................................................................... 369
14.3.10 Serial Interface Control Register (SCICR) .......................................................... 375
14.3.11 Serial Enhanced Mode Register_0 and 2 (SEMR_0 and SEMR_2) .................... 376
14.4 Operation in Asynchronous Mode .................................................................................... 380
Rev. 3.00, 03/04, page xvii of xl