Information

Section Number Title Page
Chapter 48
Touch sense input (TSI)
48.1 Introduction...................................................................................................................................................................1185
48.2 Features.........................................................................................................................................................................1185
48.3 Overview.......................................................................................................................................................................1186
48.3.1 Electrode capacitance measurement unit.....................................................................................................1186
48.3.2 Electrode scan unit.......................................................................................................................................1187
48.3.3 Touch detection unit.....................................................................................................................................1188
48.4 Modes of operation.......................................................................................................................................................1188
48.4.1 TSI disabled mode.......................................................................................................................................1189
48.4.2 TSI active mode...........................................................................................................................................1189
48.4.3 TSI low power mode....................................................................................................................................1189
48.4.4 Block diagram..............................................................................................................................................1190
48.5 TSI signal descriptions..................................................................................................................................................1191
48.5.1 TSI_IN[15:0]................................................................................................................................................1191
48.6 Memory map and register definition.............................................................................................................................1191
48.6.1 General Control and Status Register (TSIx_GENCS).................................................................................1193
48.6.2 SCAN Control Register (TSIx_SCANC).....................................................................................................1196
48.6.3 Pin Enable Register (TSIx_PEN).................................................................................................................1198
48.6.4 Wake-Up Channel Counter Register (TSIx_WUCNTR).............................................................................1200
48.6.5 Counter Register (TSIx_CNTRn)................................................................................................................1201
48.6.6 Low Power Channel Threshold Register (TSIx_THRESHOLD)................................................................1201
48.7 Functional descriptions.................................................................................................................................................1202
48.7.1 Capacitance measurement............................................................................................................................1202
48.7.2 TSI measurement result...............................................................................................................................1205
48.7.3 Electrode scan unit.......................................................................................................................................1206
48.7.4 Touch detection unit.....................................................................................................................................1209
48.8 Application information................................................................................................................................................1210
48.8.1 TSI module sensitivity.................................................................................................................................1210
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 43