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18.2.3 GPIO Interrupt Status Register ........................................................................................ 276
18.2.4 GPIO Interrupt Enable Register ....................................................................................... 277
18.2.5 GPIO Change Point Interrupt Register............................................................................. 278
18.2.6 Interrupt Level Identifying Register................................................................................... 279
18.3 REGISTER SETTING FLOW............................................................................... 280
18.4 INTERRUPT FROM GPIO PINS.......................................................................... 281
18.5 FUNCTIONS TO ACHIEVE LOW POWER CONSUMPTION ............................... 282
CHAPTER 19 PIU (TOUCH PANEL INTERFACE UNIT) .................................... 283
19.1 GENERAL........................................................................................................... 283
19.1.1 Block Diagram.................................................................................................................. 284
19.1.2 Scan Sequencer State Transition..................................................................................... 286
19.2 REGISTER SET .................................................................................................. 288
19.2.1 PIUDATAREG.................................................................................................................. 288
19.2.2 PIUCNTREG.................................................................................................................... 289
19.2.3 PIUINTREG...................................................................................................................... 291
19.2.4 PIUSIVLREG.................................................................................................................... 292
19.2.5 PIUSTBLREG................................................................................................................... 293
19.2.6 PIUCMDREG ................................................................................................................... 294
19.2.7 PIUCIVLREG.................................................................................................................... 295
19.3 REGISTER SETTING FLOW............................................................................... 296
19.4 OUTPUT TO PENCONT PINS............................................................................. 298
19.4.1 Order of Coordinate Data................................................................................................. 299
19.5 PIU OPERATION TIMINGS ................................................................................. 300
19.5.1 Explanation of signals in the timing chart......................................................................... 300
19.5.2 Battery Voltage Detection................................................................................................. 301
19.5.3 Coordinate Detection........................................................................................................ 301
19.5.4 Page Boundary Interrupt.................................................................................................. 303
19.5.5 Data Lost.......................................................................................................................... 304
19.5.6 Other cautions.................................................................................................................. 305
CHAPTER 20 SIU (SERIAL INTERFACE UNIT)................................................ 307
20.1 GENERAL........................................................................................................... 307
20.1.1 TRANSMIT/RECEIVE DATA FORMAT ........................................................................... 309
20.2 REGISTER SET .................................................................................................. 311
20.2.1 SIURXDATREG ............................................................................................................... 312
20.2.2 SIUTXDATREG................................................................................................................ 313
20.2.3 SIUCNTREG.................................................................................................................... 314
20.2.4 SIUDLENGTHREG .......................................................................................................... 317
20.2.5 SIUINTREG...................................................................................................................... 318