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2010 Microchip Technology Inc.DS39576C-page 1
PIC18FXX2/XX8
1.0DEVICE OVERVIEW
This document includes the programming specifica-
tions for the following devices:
• PIC18F242
• PIC18F248
• PIC18F252
• PIC18F258
• PIC18F442
• PIC18F448
• PIC18F452
• PIC18F458
2.0PROGRAMMING OVERVIEW
OF THE PIC18FXX2/XX8
The PIC18FXX2/XX8 can be programmed using the
high voltage In-Circuit Serial ProgrammingTM(ICSPTM)
method, or the low voltage ICSP method. Both of these
can be done with the device 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 PIC18FXX2/XX8 devices in all package
types.
2.1Hardware Requirements
In high voltage ICSP mode, the PIC18FXX2/XX8
requires two programmable power supplies: one for
VDDand one for MCLR/VPP. Both supplies should have
a minimum resolution of 0.25V. Refer to Section 6.0 for
additional hardware parameters.
2.1.1LOW VOLTAGE ICSP
PROGRAMMING
In low voltage ICSP mode, the PIC18FXX2/XX8 can be
programmed using a VDDsource 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.
2.2Pin Diagrams
The pin diagrams for the PIC18FXX2/XX8 family are
shown in Figure 2-1. The pin descriptions of these dia-
grams do not represent the complete functionality of
the device types. Users should refer to the appropriate
device data sheet for complete pin descriptions.
TABLE 2-1:PIN DESCRIPTIONS (DURING PROGRAMMING): PIC18FXX2/XX8
Pin Name
During Programming
Pin NamePin TypePin Description
MCLR/VPP VPP PProgramming Enable
VDD DDVPPower Supply
Vss VSS P Ground
RB5PGMILow Voltage ICSP™ Input when LVP
Configuration bit equals ‘1’(1)
RB6SCLKISerial Clock
RB7SDATAI/OSerial Data
Legend:I = Input, O = Output, P = Power
Note 1:See Section 5.3for more detail.
Flash Microcontroller Programming Specification
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | PIC18F452 |
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