Chapter 21
Touch Sense Input (TSI)
21.1 Introduction
The touch sensing input (TSI) module provides capacitive touch sensing detection with
high sensitivity and enhanced robustness.
Each TSI pin implements the capacitive measurement by a current source scan, charging
and discharging the electrode, once or several times. A reference oscillator ticks the scan
time and stores the result in a 16-bit register when the scan completes. Meanwhile, an
interrupt request is submitted to CPU for post-processing if TSI interrupt is enabled .The
TSI module can be periodically triggered to work in stop3 mode with ultra-low current
adder and wake CPU at the end of scan . It provides a solid capacitive measurement
module to the implementation of touch keyboard, rotaries and sliders.
21.1.1 Features
TSI features includes:
• Support up to 16 external electrodes
• Automatic detection of electrode capacitance across all operational power modes
• Internal reference oscillator for high-accuracy measurement
• Configurable software or hardware scan trigger
• Fully support Freescale touch sensing software (TSS) library, see
www.freescale.com/touchsensing
.
• Capability to wake MCU from stop 3 modes
• Compensate for temperature and supply voltage variations
• High sensitivity change with 16-bit resolution register
• Configurable up to 4096 scan times.
• The auxiliary noise detection mode supplies improved EMC immunity.
For electrode design recommendations, refer to
AN3863: Designing Touch Sensing
MC9S08PT60 Reference Manual, Rev. 4, 08/2014
Freescale Semiconductor, Inc.
579
Содержание MC9S08PT60
Страница 2: ...MC9S08PT60 Reference Manual Rev 4 08 2014 2 Freescale Semiconductor Inc...
Страница 34: ...MC9S08PT60 Reference Manual Rev 4 08 2014 34 Freescale Semiconductor Inc...
Страница 40: ...System clock distribution MC9S08PT60 Reference Manual Rev 4 08 2014 40 Freescale Semiconductor Inc...
Страница 120: ...Flash and EEPROM registers descriptions MC9S08PT60 Reference Manual Rev 4 08 2014 120 Freescale Semiconductor Inc...
Страница 200: ...Port data registers MC9S08PT60 Reference Manual Rev 4 08 2014 200 Freescale Semiconductor Inc...
Страница 228: ...System clock gating control registers MC9S08PT60 Reference Manual Rev 4 08 2014 228 Freescale Semiconductor Inc...
Страница 262: ...Human machine interfaces HMI MC9S08PT60 Reference Manual Rev 4 08 2014 262 Freescale Semiconductor Inc...
Страница 298: ...Functional Description MC9S08PT60 Reference Manual Rev 4 08 2014 298 Freescale Semiconductor Inc...
Страница 396: ...FTM Interrupts MC9S08PT60 Reference Manual Rev 4 08 2014 396 Freescale Semiconductor Inc...
Страница 440: ...Functional description MC9S08PT60 Reference Manual Rev 4 08 2014 440 Freescale Semiconductor Inc...
Страница 468: ...Initialization Application Information MC9S08PT60 Reference Manual Rev 4 08 2014 468 Freescale Semiconductor Inc...
Страница 570: ...Application information MC9S08PT60 Reference Manual Rev 4 08 2014 570 Freescale Semiconductor Inc...
Страница 648: ...Memory map and register description MC9S08PT60 Reference Manual Rev 4 08 2014 648 Freescale Semiconductor Inc...
Страница 676: ...Resets MC9S08PT60 Reference Manual Rev 4 08 2014 676 Freescale Semiconductor Inc...