NOTE
If TSI mutual mode is enabled, all 6 Tx channels/pins are
supposed to be used for TSI functions, and any unused Tx
channel (e.g. PTD1/Channel5) cannot be used for other
functions (such as GPIO). For example, if 4 Tx pins are used
for mutual touch keys, the other 2 unused Tx pins cannot be
used for GPIO or other functions. The root cause is: when
scanning one Tx channel, the TSI module pulls down all other
Tx channels (which are not in scan). All Rx channels do not
have such limitation, as Rx channels keep Hi-Z during
scanning.
48.3.1 TSI[24:0]
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 parasitic capacity on
board.
48.4 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 (TSI_GENCS)
32
R/W
0000_0000h
4004_5004 TSI DATA Register (TSI_DATA)
32
R/W
0000_0000h
4004_5008 TSI Threshold Register (TSI_TSHD)
32
R/W
0000_0000h
4004_500C TSI MODE Register (TSI_MODE)
32
R/W
003C_0060h
4004_5010 TSI MUTUAL-CAP Register 0 (TSI_MUL0)
32
R/W
603F_6300h
4004_5014 TSI MUTUAL-CAP Register 1 (TSI_MUL1)
32
R/W
0005_007Eh
4004_5018 TSI SINC filter Register (TSI_SINC)
32
R/W
0007_0001h
4004_501C TSI SSC Register 0 (TSI_SSC0)
32
R/W
6032_0000h
4004_5020 TSI SSC Register 0 (TSI_SSC1)
32
R/W
0060_0040h
4004_5024 TSI SSC Register 2 (TSI_SSC2)
32
R/W
1008_0101h
Register definition
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
1274
NXP Semiconductors
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