PIC24FJ64GA705 Datasheet, PDF (34/412 Pages) –

PIC24FJ256GA705 FAMILY
2.7 Configuration of Analog and
Digital Pins During ICSP
Operations
If an ICSP compliant emulator is selected as a debugger,
it automatically initializes all of the A/D input pins (ANx)
as “digital” pins. This is done by clearing all bits in the
ANSx registers. Refer to Section 11.2 “Configuring
Analog Port Pins (ANSx)” for more specific information.
The bits in these registers that correspond to the A/D
pins that initialized the emulator must not be changed
by the user application firmware; otherwise,
communication errors will result between the debugger
and the device.
If your application needs to use certain A/D pins as
analog input pins during the debug session, the user
application must modify the appropriate bits during
initialization of the A/D module, as follows:
• Set the bits corresponding to the pin(s) to be
configured as analog. Do not change any other
bits, particularly those corresponding to the
PGCx/PGDx pair, at any time.
When a Microchip debugger/emulator is used as a
programmer, the user application firmware must
correctly configure the ANSx registers. Automatic
initialization of these registers is only done during
debugger operation. Failure to correctly configure the
register(s) will result in all A/D pins being recognized as
analog input pins, resulting in the port value being read
as a logic ‘0’, which may affect user application
functionality.
2.8 Unused I/Os
Unused I/O pins should be configured as outputs and
driven to a logic low state. Alternatively, connect a 1 kΩ
to 10 kΩ resistor to VSS on unused pins and drive the
output to logic low.
DS30010118B-page 34
 2016 Microchip Technology Inc.