NXP Semiconductors KL25 Series - Freescale Semiconductor, Inc

TSIx_GENCS field descriptions (continued)
Field Description
27–24
MODE
TSI analog modes setup and status bits.
Set up TSI analog modes, especially, setting MODE[3:2] to not 2'b00 will configure TSI to noise detection
modes. MODE[1:0] take no effect on TSI operation mode and should always write to 2'b00 for setting up.
When reading this field will return the analog status. Refer to chapter "Noise detection mode" for details.
0000 Set TSI in capacitive sensing(non-noise detection) mode.
0100 Set TSI analog to work in single threshold noise detection mode and the frequency limitation circuit
is disabled.
1000 Set TSI analog to work in single threshold noise detection mode and the frequency limitation circuit
is enabled to work in higher frequencies operations.
1100 Set TSI analog to work in automatic noise detection mode.
23–21
REFCHRG
REFCHRG
These bits indicate the reference oscillator charge and discharge current value.
000 500 nA.
001 1 μA.
010 2 μA.
011 4 μA.
100 8 μA.
101 16 μA.
110 32 μA.
111 64 μA.
20–19
DVOLT
DVOLT
These bits indicate the oscillator's voltage rails as below.
00 DV = 1.03 V; V
P
= 1.33 V; V
m
= 0.30 V.
01 DV = 0.73 V; V
P
= 1.18 V; V
m
= 0.45 V.
10 DV = 0.43 V; V
P
= 1.03 V; V
m
= 0.60 V.
11 DV = 0.29 V; V
P
= 0.95 V; V
m
= 0.67 V.
18–16
EXTCHRG
EXTCHRG
These bits indicate the electrode oscillator charge and discharge current value.
000 500 nA.
001 1 μA.
010 2 μA.
011 4 μA.
100 8 μA.
101 16 μA.
110 32 μA.
111 64 μA.
15–13
PS
PS
These bits indicate the prescaler of the output of electrode oscillator.
000 Electrode Oscillator Frequency divided by 1
001 Electrode Oscillator Frequency divided by 2
Table continues on the next page...
Chapter 42 Touch Sensing Input (TSI)
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 789