Table of Contents
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10.8.3 Notes on Register Access ..................................................................................... 257
10.9 Using the WDT ................................................................................................................. 258
10.9.1 Standby Clearing Procedure................................................................................. 258
10.9.2 Frequency Changing Procedure ........................................................................... 258
10.9.3 Using Watchdog Timer Mode.............................................................................. 259
10.9.4 Using Interval Timer Mode.................................................................................. 259
10.10 Notes on Board Design...................................................................................................... 260
11.1 Overview ........................................................................................................................... 263
11.1.1 Features ................................................................................................................ 263
11.1.2 Block Diagram ..................................................................................................... 264
11.1.3 Pin Configuration ................................................................................................. 265
11.1.4 Register Configuration ......................................................................................... 265
11.2 Register Descriptions......................................................................................................... 267
11.2.1 64 Hz Counter (R64CNT) .................................................................................... 267
11.2.2 Second Counter (RSECCNT)............................................................................... 267
11.2.3 Minute Counter (RMINCNT) .............................................................................. 268
11.2.4 Hour Counter (RHRCNT) .................................................................................... 268
11.2.5 Day-of-Week Counter (RWKCNT) ..................................................................... 269
11.2.6 Day Counter (RDAYCNT) .................................................................................. 270
11.2.7 Month Counter (RMONCNT).............................................................................. 270
11.2.8 Year Counter (RYRCNT) .................................................................................... 271
11.2.9 Second Alarm Register (RSECAR)...................................................................... 272
11.2.10 Minute Alarm Register (RMINAR) ..................................................................... 272
11.2.11 Hour Alarm Register (RHRAR) ........................................................................... 273
11.2.12 Day-of-Week Alarm Register (RWKAR) ............................................................ 273
11.2.13 Day Alarm Register (RDAYAR) ......................................................................... 274
11.2.14 Month Alarm Register (RMONAR)..................................................................... 275
11.2.15 RTC Control Register 1 (RCR1) .......................................................................... 275
11.2.16 RTC Control Register 2 (RCR2) .......................................................................... 277
(SH7751R Only) .................................................................................................. 280
11.3 Operation........................................................................................................................... 281
11.3.1 Time Setting Procedures ...................................................................................... 281
11.3.2 Time Reading Procedures .................................................................................... 282
11.3.3 Alarm Function .................................................................................................... 284
11.4 Interrupts ........................................................................................................................... 285
11.5 Usage Notes....................................................................................................................... 285
11.5.1 Register Initialization ........................................................................................... 285
11.5.2 Carry Flag and Interrupt Flag in Standby Mode................................................... 285
11.5.3 Crystal Oscillator Circuit...................................................................................... 285
Rev. 3.0, 04/02, page x of xxxviii
.................................................................................. 263
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