Datasheet

Rev. 4.00 Mar. 15, 2006 Page xvii of xxxii
16.4.11 Interrupt Requests............................................................................................. 377
16.5 Usage Note........................................................................................................................ 378
Section 17 Subsystem Timer (Subtimer)...........................................................379
17.1 Features............................................................................................................................. 379
17.2 Register Descriptions........................................................................................................ 381
17.2.1 Subtimer Control Register (SBTCTL).............................................................. 381
17.2.2 Subtimer Counter (SBTDCNT)........................................................................ 382
17.2.3 Ring Oscillator Prescaler Setting Register (ROPCR) ....................................... 382
17.3 Operation .......................................................................................................................... 383
17.3.1 SBTPS Division Ratio Setting.......................................................................... 383
17.4 Count Operation................................................................................................................ 387
17.5 Usage Notes...................................................................................................................... 390
17.5.1 Clock Supply to Watchdog Timer .................................................................... 390
17.5.2 Writing to ROPCR............................................................................................ 390
Section 18 A/D Converter..................................................................................391
18.1 Features............................................................................................................................. 391
18.2 Input/Output Pins.............................................................................................................. 393
18.3 Register Descriptions........................................................................................................ 394
18.3.1 A/D Data Registers A to D (ADDRA to ADDRD) .......................................... 394
18.3.2 A/D Control/Status Register (ADCSR) ............................................................ 395
18.3.3 A/D Control Register (ADCR) .........................................................................396
18.4 Operation .......................................................................................................................... 397
18.4.1 Single Mode...................................................................................................... 397
18.4.2 Scan Mode ........................................................................................................ 397
18.4.3 Input Sampling and A/D Conversion Time ...................................................... 398
18.4.4 External Trigger Input Timing.......................................................................... 399
18.5 A/D Conversion Accuracy Definitions............................................................................. 400
18.6 Usage Notes...................................................................................................................... 402
18.6.1 Permissible Signal Source Impedance .............................................................. 402
18.6.2 Influences on Absolute Accuracy ..................................................................... 402
Section 19 Power-On Reset and Low-Voltage Detection Circuits
(Optional).........................................................................................403
19.1 Features............................................................................................................................. 404
19.2 Register Descriptions........................................................................................................ 405
19.2.1 Low-Voltage-Detection Control Register (LVDCR)........................................ 405
19.2.2 Low-Voltage-Detection Status Register (LVDSR)........................................... 407
19.3 Operation .......................................................................................................................... 408