Table of Contents
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2.12.1 Overview ............................................................................................................................................ 253
2.12.2 Operation of Watchdog Timer (Watchdog timer interrupt) ........................................................... 256
2.13 Address Match Interrupt Usage .............................................................................. 258
2.13.1 Overview of the address match interrupt usage ............................................................................ 258
2.13.2 Operation of Address Match Interrupt ............................................................................................ 260
2.14 Key-Input Interrupt Usage ....................................................................................... 262
2.14.1 Overview of the key-input interrupt usage ..................................................................................... 262
2.14.2 Operation of Key-Input Interrupt ..................................................................................................... 265
2.15 Multiple interrupts Usage ........................................................................................ 267
2.15.1 Overview of the Multiple interrupts usage ..................................................................................... 267
2.15.2 Multiple Interrupts Operation ........................................................................................................... 272
2.16 Power Control Usage ............................................................................................... 274
2.16.1 Overview of the power control usage ............................................................................................. 274
2.16.2 Stop Mode Set-Up ............................................................................................................................. 280
2.16.3 Wait Mode Set-Up .............................................................................................................................. 281
2.16.4 Precautions in Power Control .......................................................................................................... 282
2.17 Programmable I/O Ports Usage ............................................................................... 284
2.17.1 Overview of the programmable I/O ports usage ............................................................................ 284
Chapter 3. Examples of Peripheral Functions
3.1 Long-Period Timers .................................................................................................... 295
3.2 Variable-Period Variable-Duty PWM Output ............................................................. 299
3.3 Buzzer Output ............................................................................................................. 303
3.4 Solution for External Interrupt Pins Shortage ......................................................... 305
3.5 Memory to Memory DMA Transfer ............................................................................ 307
3.7 Buzzer Output ............................................................................................................. 311
Serial Data Transmit ................................................................................................... 311
3.7 Transfer from USB FIFO to Serial Sound Interface ................................................. 316
3.8 Controlling Power Using Stop Mode ........................................................................ 321
3.9 Controlling Power Using Wait Mode ......................................................................... 325
Chapter 4. External Buses ............................................... 329
4.1 Overview of External Buses ...................................................................................... 330
4.2 Data Access ................................................................................................................ 331
4.2.1 Data Bus Width ................................................................................................................................... 331
4.2.2 Chip Selects and Address Bus .......................................................................................................... 332
4.2.3 R/W Modes ........................................................................................................................................... 333
4.3 Connection Examples ................................................................................................ 334
4.3.1 16-bit Memory to 16-bit Width Data Bus Connection Example ...................................................... 334
4.3.2 8-bit Memory to 16-bit Width Data Bus Connection Example ........................................................ 335
Applications ................................................... 293
A-3
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