Table of Contents
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11.2.8 Year Counter (RYRCNT) .................................................................................... 225
11.2.9 Second Alarm Register (RSECAR) ..................................................................... 226
11.2.10 Minute Alarm Register (RMINAR) ..................................................................... 226
11.2.11 Hour Alarm Register (RHRAR) .......................................................................... 227
11.2.12 Day-of-Week Alarm Register (RWKAR)............................................................ 227
11.2.13 Day Alarm Register (RDAYAR) ......................................................................... 228
11.2.14 Month Alarm Register (RMONAR) .................................................................... 229
11.2.15 RTC Control Register 1 (RCR1).......................................................................... 229
11.2.16 RTC Control Register 2 (RCR2).......................................................................... 231
11.3 Operation .......................................................................................................................... 234
11.3.1 Time Setting Procedures ...................................................................................... 234
11.3.2 Time Reading Procedures .................................................................................... 235
11.3.3 Alarm Function .................................................................................................... 237
11.4 Interrupts........................................................................................................................... 238
11.5 Usage Notes ...................................................................................................................... 238
11.5.1 Register Initialization........................................................................................... 238
11.5.2 Crystal Oscillator Circuit ..................................................................................... 238
12.1 Overview........................................................................................................................... 241
12.1.1 Features................................................................................................................ 241
12.1.2 Block Diagram..................................................................................................... 242
12.1.3 Pin Configuration................................................................................................. 242
12.1.4 Register Configuration......................................................................................... 243
12.2 Register Descriptions ........................................................................................................ 244
12.2.1 Timer Output Control Register (TOCR) .............................................................. 244
12.2.2 Timer Start Register (TSTR)................................................................................ 245
12.2.3 Timer Constant Registers (TCOR) ...................................................................... 246
12.2.4 Timer Counters (TCNT) ...................................................................................... 246
12.2.5 Timer Control Registers (TCR) ........................................................................... 247
12.2.6 Input Capture Register (TCPR2).......................................................................... 250
12.3 Operation .......................................................................................................................... 251
12.3.1 Counter Operation................................................................................................ 251
12.3.2 Input Capture Function ........................................................................................ 254
12.4 Interrupts........................................................................................................................... 255
12.5 Usage Notes ...................................................................................................................... 256
12.5.1 Register Writes .................................................................................................... 256
12.5.2 TCNT Register Reads .......................................................................................... 256
12.5.3 Resetting the RTC Frequency Divider................................................................. 256
12.5.4 External Clock Frequency.................................................................................... 256
13.1 Overview........................................................................................................................... 257
Rev. 4.0, 04/00, page xiv of 20
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