PIC12F1840 MICROCHIP [Microchip Technology], PIC12F1840 Datasheet - Page 293

• Manufacturer Part Number: PIC12F1840
• Description: 8-Pin Flash Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

27.0
The Capacitive Sensing (CPS) module allows for an
interaction with an end user without a mechanical
interface. In a typical application, the CPS 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 CPS
module. The CPS 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 Power modes
• High power range with variable voltage references
• Multiple timer resources
• Software control
• Operation during Sleep
FIGURE 27-1:
 2011 Microchip Technology Inc.
Note
CPS0
CPS1
CPS2
CPS3
CAPACITIVE SENSING (CPS)
MODULE
1:
If CPSON = 0, disabling capacitive sensing, no channel is selected.
CAPACITIVE SENSING BLOCK DIAGRAM
CPSCH<3:0>
CPSON
Ref-
(1)
0
1
Capacitive
Oscillator
CPSOSC
CPSRM
Sensing
DAC
Ref+
CPSRNG<1:0>
CPSON
0
1
FVR
Ref.
Int.
T0CKI
Preliminary
T0XCS
CPSOUT
CPSCLK
0
1
F
OSC
SYNCC1OUT
T1GSEL<1:0>
T1CS<1:0>
/4
T1OSC/
F
F
T1CKI
T1G
OSC
OSC
0
1
/4
PIC12F/LF1840
TMR0CS
Timer0 Module
TMR0
Timer1 Module
Control Logic
Timer1 Gate
EN
TMR1H:TMR1L
Overflow
DS41441A-page 293
TMR0IF
Set