Hitachi SH7750 Hardware Manual page 26

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