SH7018 datasheet(11/431 Pages) RENESAS

11 / 431 page

10.2

Register Descriptions......................................................................................................... 180

10.2.1 Compare Match Timer Start Register (CMSTR) ................................................. 180

10.2.2 Compare Match Timer Control/Status Register (CMCSR).................................. 181

10.2.3 Compare Match Timer Counter (CMCNT).......................................................... 182

10.2.4 Compare Match Timer Constant Register (CMCOR).......................................... 183

10.3

Operation ........................................................................................................................... 183

10.3.1 Period Count Operation........................................................................................ 183

10.3.2 CMCNT Count Timing ........................................................................................ 184

10.4

Interrupts............................................................................................................................ 184

10.4.1 Interrupt Sources .................................................................................................. 184

10.4.2 Compare Match Flag Set Timing ......................................................................... 184

10.4.3 Compare Match Flag Clear Timing...................................................................... 185

10.5

Notes on Use...................................................................................................................... 186

10.5.1 Contention between CMCNT Write and Compare Match ................................... 186

10.5.2 Contention between CMCNT Word Write and Incrementation .......................... 187

10.5.3 Contention between CMCNT Byte Write and Incrementation ............................ 188

Section 11 Watchdog Timer (WDT).............................................................................. 189

11.1

Overview............................................................................................................................ 189

11.1.1 Features ................................................................................................................ 189

11.1.2 Block Diagram...................................................................................................... 190

11.1.3 Register Configuration ......................................................................................... 191

11.2

Register Descriptions......................................................................................................... 191

11.2.1 Timer Counter (TCNT) ........................................................................................ 191

11.2.2 Timer Control/Status Register (TCSR) ................................................................ 192

11.2.3 Reset Control/Status Register (RSTCSR) ............................................................ 193

11.2.4 Register Access .................................................................................................... 194

11.3

Operation ........................................................................................................................... 195

11.3.1 Watchdog Timer Mode ........................................................................................ 195

11.3.2 Interval Timer Mode ............................................................................................ 197

11.3.3 Clearing the Standby Mode.................................................................................. 197

11.3.4 Timing of Setting the Overflow Flag (OVF)........................................................ 198

11.3.5 Timing of Setting the Watchdog Timer Overflow Flag (WOVF)........................ 198

11.4

Notes on Use...................................................................................................................... 199

11.4.1 TCNT Write and Increment Contention............................................................... 199

11.4.2 Changing CKS2 to CKS0 Bit Values ................................................................... 199

11.4.3 Changing between Watchdog Timer/Interval Timer Modes................................ 199

11.4.4 Internal Reset With the Watchdog Timer ............................................................ 199

Section 12 Serial Communication Interface (SCI1) .................................................. 201

12.1

Overview............................................................................................................................ 201

12.1.1 Features ................................................................................................................ 201

12.1.2 Block Diagram...................................................................................................... 202

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