Datasheet
PIC18F66K80 FAMILY
DS39977F-page 252 2010-2012 Microchip Technology Inc.
18.10 Operation During Sleep/Idle Modes
18.10.1 SLEEP MODE
When the device enters any Sleep mode, the CTMU
module current source is always disabled. If the CTMU
is performing an operation that depends on the current
source when Sleep mode is invoked, the operation may
not terminate correctly. Capacitance and time
measurements may return erroneous values.
18.10.2 IDLE MODE
The behavior of the CTMU in Idle mode is determined
by the CTMUSIDL bit (CTMUCONH<5>). If CTMUSIDL
is cleared, the module will continue to operate in Idle
mode. If CTMUSIDL is set, the module’s current source
is disabled when the device enters Idle mode. In this
case, if the module is performing an operation when
Idle mode is invoked, the results will be similar to those
with Sleep mode.
18.11 Effects of a Reset on CTMU
Upon Reset, all registers of the CTMU are cleared. This
disables the CTMU module, turns off its current source
and returns all configuration options to their default set-
tings. The module needs to be re-initialized following
any Reset.
If the CTMU is in the process of taking a measurement
at the time of Reset, the measurement will be lost. A
partial charge may exist on the circuit that was being
measured, which should be properly discharged before
the CTMU makes subsequent attempts to make a
measurement. The circuit is discharged by setting and
clearing the IDISSEN bit (CTMUCONH<1>) while the
A/D Converter is connected to the appropriate channel.
TABLE 18-1: REGISTERS ASSOCIATED WITH CTMU MODULE
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
CTMUCONH CTMUEN — CTMUSIDL TGEN EDGEN EDGSEQEN IDISSEN CTTRIG
CTMUCONL EDG2POL EDG2SEL1 EDG2SEL0 EDG1POL EDG1SEL1 EDG1SEL0 EDG2STAT EDG1STAT
CTMUICON ITRIM5 ITRIM4 ITRIM3 ITRIM2 ITRIM1 ITRIM0 IRNG1 IRNG0
PIR3
— — RC2IF TX2IF CTMUIF CCP2IF CCP1IF —
PIE3
— — RC2IE TX2IE CTMUIE CCP2IE CCP1IE —
IPR3
— — RC2IP TX2IP CTMUIP CCP2IP CCP1IP —
PADCFG1
RDPU REPU RFPU RGPU — — — CTMUDS
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used during ECCP operation.