SH7052 datasheet(17/919 Pages) RENESAS

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vii

12.2.2 Timer Control/Status Register (TCSR) ................................................................ 416

12.2.3 Reset Control/Status Register (RSTCSR) ............................................................ 418

12.2.4 Register Access .................................................................................................... 419

12.3

Operation ........................................................................................................................... 420

12.3.1 Watchdog Timer Mode ........................................................................................ 420

12.3.2 Interval Timer Mode ............................................................................................ 422

12.3.3 Clearing Software Standby Mode ........................................................................ 422

12.3.4 Timing of Setting the Overflow Flag (OVF)........................................................ 423

12.3.5 Timing of Setting the Watchdog Timer Overflow Flag (WOVF)........................ 423

12.4

Usage Notes ....................................................................................................................... 424

12.4.1 TCNT Write and Increment Contention............................................................... 424

12.4.2 Changing CKS2 to CKS0 Bit Values ................................................................... 424

12.4.3 Changing between Watchdog Timer/Interval Timer Modes................................ 424

12.4.4 System Reset by

WDTOVF Signal...................................................................... 425

12.4.5 Internal Reset in Watchdog Timer Mode ............................................................. 425

12.4.6 Manual Reset in Watchdog Timer........................................................................ 425

Section 13 Compare Match Timer (CMT) ................................................................... 427

13.1

Overview............................................................................................................................ 427

13.1.1 Features ................................................................................................................ 427

13.1.2 Block Diagram...................................................................................................... 428

13.1.3 Register Configuration ......................................................................................... 429

13.2

Register Descriptions......................................................................................................... 430

13.2.1 Compare Match Timer Start Register (CMSTR) ................................................. 430

13.2.2 Compare Match Timer Control/Status Register (CMCSR).................................. 431

13.2.3 Compare Match Timer Counter (CMCNT).......................................................... 432

13.2.4 Compare Match Timer Constant Register (CMCOR).......................................... 433

13.3

Operation ........................................................................................................................... 433

13.3.1 Cyclic Count Operation........................................................................................ 433

13.3.2 CMCNT Count Timing ........................................................................................ 434

13.4

Interrupts............................................................................................................................ 434

13.4.1 Interrupt Sources and DTC Activation................................................................. 434

13.4.2 Compare Match Flag Set Timing ......................................................................... 434

13.4.3 Compare Match Flag Clear Timing...................................................................... 435

13.5

Usage Notes ....................................................................................................................... 436

13.5.1 Contention between CMCNT Write and Compare Match ................................... 436

13.5.2 Contention between CMCNT Word Write and Incrementation .......................... 437

13.5.3 Contention between CMCNT Byte Write and Incrementation ............................ 438

Section 14 Serial Communication Interface (SCI) .................................................... 439

14.1

Overview............................................................................................................................ 439

14.1.1 Features ................................................................................................................ 439

14.1.2 Block Diagram...................................................................................................... 440

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