NXP Semiconductors KL25 Series - External Signal Description

42.2 External signal description
The TSI module contains up to 16 external pins for touch sensing. The following table
describes each of the TSI external pins.
Table 42-2. TSI signal description
Name Port Direction Function Reset state
TSI[15:0] TSI I/O TSI capacitive pins.
Switches driver that
connects directly to the
electrode pins TSI[15:0]
can operate as GPIO
pins.
I/O
42.2.1 TSI[15:0]
When TSI functionality is enabled , the TSI analog portion uses the corresponding
channel to connect external on-board touch capacitors. The PCB connection between the
pin and the touch pad must be kept as short as possible to reduce distribution capacity on
board.
42.3 Register definition
This section describes the memory map and control/status registers for the TSI module.
TSI memory map
Absolute
address
(hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
4004_5000 TSI General Control and Status Register (TSI0_GENCS) 32 R/W 0000_0000h 42.3.1/787
4004_5004 TSI DATA Register (TSI0_DATA) 32 R/W 0000_0000h 42.3.2/792
4004_5008 TSI Threshold Register (TSI0_TSHD) 32 R/W 0000_0000h 42.3.3/793
42.3.1 TSI General Control and Status Register (TSIx_GENCS)
This control register provides various control and configuration information for the TSI
module.
Chapter 42 Touch Sensing Input (TSI)
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 787