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Page xx of xl R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
13.5.2 Prohibition against Setting H'FF to WTCNT .................................................... 673
13.5.3 Interval Timer Overflow Flag ........................................................................... 673
13.5.4 System Reset by WDTOVF Signal ................................................................... 674
13.5.5 Manual Reset in Watchdog Timer Mode .......................................................... 674
13.5.6 Internal Reset in Watchdog Timer Mode .......................................................... 674
Section 14 Realtime Clock ................................................................................ 675
14.1 Features ............................................................................................................................. 675
14.2 Input/Output Pin ............................................................................................................... 677
14.3 Register Descriptions ........................................................................................................ 677
14.3.1 64-Hz Counter (R64CNT) ................................................................................ 678
14.3.2 Second Counter (RSECCNT) ........................................................................... 679
14.3.3 Minute Counter (RMINCNT) ........................................................................... 680
14.3.4 Hour Counter (RHRCNT) ................................................................................ 681
14.3.5 Day of Week Counter (RWKCNT) .................................................................. 682
14.3.6 Date Counter (RDAYCNT) .............................................................................. 683
14.3.7 Month Counter (RMONCNT) .......................................................................... 684
14.3.8 Year Counter (RYRCNT) ................................................................................. 685
14.3.9 Second Alarm Register (RSECAR) .................................................................. 686
14.3.10 Minute Alarm Register (RMINAR) .................................................................. 687
14.3.11 Hour Alarm Register (RHRAR) ....................................................................... 688
14.3.12 Day of Week Alarm Register (RWKAR) ......................................................... 689
14.3.13 Date Alarm Register (RDAYAR) ..................................................................... 690
14.3.14 Month Alarm Register (RMONAR) ................................................................. 691
14.3.15 Year Alarm Register (RYRAR) ........................................................................ 692
14.3.16 Control Register 1 (RCR1) ............................................................................... 693
14.3.17 Control Register 2 (RCR2) ............................................................................... 695
14.3.18 Control Register 3 (RCR3) ............................................................................... 697
14.3.19 Control Register 5 (RCR5) ............................................................................... 698
14.3.20 Frequency Register H/L (RFRH/L) .................................................................. 699
14.4 Operation .......................................................................................................................... 701
14.4.1 Initial Settings of Registers after Power-On ..................................................... 701
14.4.2 Setting Time...................................................................................................... 701
14.4.3 Reading Time .................................................................................................... 702
14.4.4 Alarm Function ................................................................................................. 703
14.5 Usage Notes ...................................................................................................................... 704
14.5.1 Register Writing during Count.......................................................................... 704
14.5.2 Use of Realtime Clock Periodic Interrupts ....................................................... 704
14.5.3 Transition to Standby Mode after Setting Register ........................................... 704
14.5.4 Usage Notes when Writing to and Reading the Register .................................. 705