PIC18C242 MICROCHIP [Microchip Technology], PIC18C242 Datasheet - Page 189
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PIC18C242
Manufacturer Part Number
PIC18C242
Description
High-Performance Microcontrollers with 10-Bit A/D
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C242.pdf
(296 pages)
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18.4
If the code protection bit(s) have not been pro-
grammed, the on-chip program memory can be read
out for verification purposes.
18.5
Five memory locations (200000h - 200004h) are desig-
nated as ID locations, where the user can store check-
sum or other code-identification numbers. These
locations are accessible during normal execution
through the TBLRD instruction or during program/ver-
ify. The ID locations can be read when the device is
code protected.
7/99 Microchip Technology Inc.
Note:
Program Verification/Code Protection
ID Locations
Microchip Technology does not recom-
mend code protecting windowed devices.
Preliminary
18.6
PIC18CXXX microcontrollers can be serially pro-
grammed while in the end application circuit. This is
simply done with two lines for clock and data, and three
other lines for power, ground and the programming volt-
age. This allows customers to manufacture boards with
unprogrammed devices, and then program the micro-
controller just before shipping the product. This also
allows the most recent firmware or a custom firmware
to be programmed.
In-Circuit Serial Programming
PIC18CXX2
DS39026B-page 189
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