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PIC18F010 Datasheet(PDF) 95 Page - Microchip Technology |
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PIC18F010 Datasheet(HTML) 95 Page - Microchip Technology |
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95 / 176 page  2001 Microchip Technology Inc. Preliminary DS41142A-page 93 PIC18F010/020 12.5 Program Verification/Code Protection If the code protection bit(s) have not been pro- grammed, the on-chip program memory can be read out for verification purposes. 12.6 ID Locations Five memory locations (200000h - 200007h) 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/ verify. The ID locations can be read when the device is code protected. 12.7 In-Circuit Serial Programming PIC18F010/020 microcontrollers can be serially pro- grammed while in the end application circuit. This is simply done with two lines for clock and data, and two other lines for power and ground. This allows custom- ers to manufacture boards with unprogrammed devices, and then program the microcontroller just before shipping the product. This also allows the most recent firmware or a custom firmware to be programmed. Note: Microchip Technology does not recom- mend code protecting windowed devices. |
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