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PIC16F1933-E/P Datasheet(PDF) 179 Page - Microchip Technology |
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PIC16F1933-E/P Datasheet(HTML) 179 Page - Microchip Technology |
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179 / 418 page ![]() © 2008 Microchip Technology Inc. Preliminary DS41364A-page 177 PIC16F193X/LF193X 18.0 CAPACITIVE SENSING MODULE The capacitive sensing module allows for an interaction with an end user without a mechanical interface. In a typical application, the capacitive sensing module is attached to a pad on a Printed Circuit Board (PCB), which is electrically isolated from the end user. When the end user places their finger over the PCB pad, a capacitive load is added, causing a frequency shift in the capacitive sensing module. The capacitive sensing module requires software and at least one timer resource to determine the change in frequency. Key features of this module include: • Analog MUX for monitoring multiple inputs • Capacitive sensing oscillator • Multiple timer resources • Software control • Operation during Sleep FIGURE 18-1: CAPACITIVE SENSING BLOCK DIAGRAM TMR0CS CPS0 CPS1 CPS2 CPS3 CPS4 CPS5 CPS6 CPS7 CPS8(1) CPS9(1) CPS10(1) CPSCH<3:0>(2) Capacitive Sensing Oscillator CPSOSC CPSON CPSRNG<1:0> TMR0 0 1 Set TMR0IF Overflow T0XCS 0 1 T0CKI T1CS<1:0> T1OSC/ T1CKI TMR1H:TMR1L EN T1GSEL<1:0> Timer1 Gate Control Logic T1G CPSOUT CPS11(1) CPS12(1) CPS13(1) CPS14(1) CPS15(1) CPSCLK Note 1: Reference Register 18-2 for channels implemented on each device 2: CPSCH3 is not implemented on PIC16F1933/1936/1938/PIC16LF1933/1936/1938. 3: If CPSON = 0, disabling capacitive sensing, no channel is selected. FOSC/4 FOSC FOSC/4 Timer0 Module Timer1 Module CPSON(3) CPS16(1) SYNCC1OUT SYNCC2OUT |
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