SH7750 datasheet(28/1039 Pages) RENESAS

28 / 1039 page

Rev. 6.0, 07/02, page xxvi of I

10.9

Using the WDT ................................................................................................................. 263

10.9.1 Standby Clearing Procedure................................................................................. 263

10.9.2 Frequency Changing Procedure ........................................................................... 264

10.9.3 Using Watchdog Timer Mode.............................................................................. 264

10.9.4 Using Interval Timer Mode.................................................................................. 265

10.10 Notes on Board Design...................................................................................................... 265

Section 11 Realtime Clock (RTC) .................................................................................. 267

11.1

Overview ........................................................................................................................... 267

11.1.1 Features ................................................................................................................ 267

11.1.2 Block Diagram ..................................................................................................... 268

11.1.3 Pin Configuration ................................................................................................. 269

11.1.4 Register Configuration ......................................................................................... 269

11.2

Register Descriptions ........................................................................................................ 271

11.2.1 64 Hz Counter (R64CNT) .................................................................................... 271

11.2.2 Second Counter (RSECCNT)............................................................................... 271

11.2.3 Minute Counter (RMINCNT) .............................................................................. 272

11.2.4 Hour Counter (RHRCNT) .................................................................................... 272

11.2.5 Day-of-Week Counter (RWKCNT) ..................................................................... 273

11.2.6 Day Counter (RDAYCNT) .................................................................................. 274

11.2.7 Month Counter (RMONCNT).............................................................................. 274

11.2.8 Year Counter (RYRCNT) .................................................................................... 275

11.2.9 Second Alarm Register (RSECAR)...................................................................... 276

11.2.10 Minute Alarm Register (RMINAR) ..................................................................... 276

11.2.11 Hour Alarm Register (RHRAR)........................................................................... 277

11.2.12 Day-of-Week Alarm Register (RWKAR) ............................................................ 277

11.2.13 Day Alarm Register (RDAYAR) ......................................................................... 278

11.2.14 Month Alarm Register (RMONAR)..................................................................... 279

11.2.15 RTC Control Register 1 (RCR1) .......................................................................... 279

11.2.16 RTC Control Register 2 (RCR2) .......................................................................... 281

11.2.17 RTC Control Register 3 (RCR3) and Year-Alarm Register (RYRAR)

(SH7750R Only) .................................................................................................. 283

11.3

Operation........................................................................................................................... 285

11.3.1 Time Setting Procedures ...................................................................................... 285

11.3.2 Time Reading Procedures .................................................................................... 286

11.3.3 Alarm Function .................................................................................................... 288

11.4

Interrupts ........................................................................................................................... 289

11.5

Usage Notes....................................................................................................................... 289

11.5.1 Register Initialization ........................................................................................... 289

11.5.2 Carry Flag and Interrupt Flag in Standby Mode................................................... 289

11.5.3 Crystal Oscillator Circuit...................................................................................... 289

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