PIC18LF2X Datasheet, PDF (2/44 Pages) Microchip Technology – 28/40/44-Pin, Low-Power, High-Performance Microcontrollers with XLP Technology

PIC18(L)F2X/4XK50
2.2.1 ICPORT DISABLED
Clearing the ICPRT bit in CONFIG4L disables the use
of the dedicated port function and leaves the dedicated
pins floating. High-voltage and low-voltage
programming are performed using the MCLR/VPP,
PGC and PGD pins as normal. This is otherwise known
as the legacy interface mode, using the standard
interface pins.
2.2.2 ICPORT ENABLED
Setting the ICPRT bit in CONFIG4L enables the use of
the dedicated port function through the dedicated pins.
This is the default setting for the ICPRT bit upon start-
up or Reset. When using devices in packages other
than the 44-pin TQFP, the ICPRT bit must be cleared.
The standard interface pins will remain operational,
even after the dedicated pins are enabled, unless the
user assigns another function to them in firmware. If
another function is not assigned to the standard pins
and both sets of pins remain operable for program-
ming, whichever high-voltage entry pin (the standard
VPP pin or the dedicated ICDVPP pin) is activated first
will take priority.
For high-voltage programming, if high-voltage is
detected on the ICDVPP pin first, the standard MCLR/
VPP pin will be ignored and programming must be
performed using the ICDPGC and ICDPGD pins. If
high-voltage is detected on the MCLR/VPP pin first, the
dedicated ICDVPP pin will be ignored and programming
must be performed using the PGC and PGD pins.
These same rules apply to the low-voltage
programming sequence.
2.3 Pin Diagrams
The pin diagrams for the PIC18(L)F2X/4XK50 family
are shown in Figures 2-1 through 2-4.
TABLE 2-1: PIN DESCRIPTIONS (DURING PROGRAMMING): PIC18(L)F2X/4XK50
Pin Name
During Programming
Pin
Pin Type
Pin Description
MCLR/VPP/RE3
VDD⁽¹⁾
VSS⁽¹⁾
VPP
P
Programming Enable
VDD
P
Power Supply
VSS
P
Ground
RB6
PGC
I
Serial Clock
RB7
ICDRST/ICDVPP⁽²⁾
PGD
VPP
I/O
Serial Data
P
Programming Enable
ICDCLK/ICDPGC
ICDDAT/ICDPGD⁽²⁾
PGC
PGD
I
Serial Clock
I/O
Serial Data
Legend: I = Input, O = Output, P = Power
Note 1: All power supply (VDD) and ground (VSS) pins must be connected.
2: Dedicated ICSP/ICD Port available on 44-pin TQFP only when the ICPRT bit in CONFIG4L is enabled.
DS41630B-page 2
 2012 Microchip Technology Inc.