Datasheet

 2010 Microchip Technology Inc. Preliminary DS39974A-page 409
PIC18F47J13 FAMILY
26.7 Operation During Sleep/Idle
Modes
26.7.1 SLEEP MODE AND DEEP SLEEP
MODES
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.
26.7.2 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.
26.8 Effects of a Reset on CTMU
Upon Reset, all registers of the CTMU are cleared. This
leaves the CTMU module disabled; its current source is
turned off and all configuration options return to their
default settings. 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, and should be properly discharged before
the CTMU makes subsequent attempts to make a
measurement. The circuit is discharged by setting and
then clearing the IDISSEN bit (CTMUCONH<1>) while
the A/D Converter is connected to the appropriate
channel.