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2010 Microchip Technology Inc. Preliminary DS30480C-page 1
PIC18FXX39
1.0 DEVICE OVERVIEW
This document includes the programming
specifications for the following devices:
• PIC18F2439
• PIC18F2539
• PIC18F4439
• PIC18F4539
2.0 PROGRAMMING OVERVIEW
OF THE PIC18FXX39
The PIC18FXX39 can be programmed using the high
voltage In-Circuit Serial Programming
TM
(ICSP
TM
)
method, or the low voltage ICSP method; both while in
the users’ system. The low voltage ICSP method is
slightly different than the high voltage method, and
these differences are noted where applicable. This
programming specification applies to PIC18FXX39
devices in all package types.
2.1 Hardware Requirements
In High Voltage ICSP mode, the PIC18FXX39 requires
two programmable power supplies: one for V
DD and
one for MCLR
/VPP. Both supplies should have a
minimum resolution of 0.25V. Refer to Section 6.0 for
additional hardware parameters.
2.1.1 LOW VOLTAGE ICSP
PROGRAMMING
In Low Voltage ICSP mode, the PIC18FXX39 can be
programmed using a V
DD source in the operating
range. This only means that MCLR
/VPP does not have
to be brought to a different voltage, but can instead be
left at the normal operating voltage. Refer to
Section 6.0 for additional hardware parameters.
2.2 Pin Diagrams
The pin diagrams for the PIC18FXX39 family are
shown in Figure 2-1. The pin descriptions of these
diagrams do not represent the complete functionality of
the device types. One should refer to the appropriate
device data sheet for complete pin descriptions.
TABLE 2-1: PIN DESCRIPTIONS (DURING PROGRAMMING): PIC18FXX39
Pin Name
During Programming
Pin Name Pin Type Pin Description
MCLR
/VPP VPP P Programming Enable
V
DD VDD P Power Supply
Vss V
SS P Ground
RB5 PGM I Low Voltage ICSP™ Input when LVP
Configuration bit equals ‘1’
(1)
RB6 SCLK I Serial Clock
RB7 SDATA I/O Serial Data
Legend: I = Input, O = Output, P = Power
Note 1: See Section 5.3 for more detail.
Programming for PIC18FXX39 Flash MCUs
