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PORTGPA Datasheet(PDF) 80 Page - Microchip Technology |
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PORTGPA Datasheet(HTML) 80 Page - Microchip Technology |
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80 / 222 page  MCP19111 DS22331A-page 80 2013 Microchip Technology Inc. 12.2 Code Protection Code protection allows the device to be protected from unauthorized access. Internal access to the program memory is unaffected by any code protection setting. 12.2.1 PROGRAM MEMORY PROTECTION The entire program memory space is protected from external reads and writes by the CP bit in the Configuration Word. When CP = 0, external reads and writes of the program memory are inhibited and a read will return all ‘0’s. The CPU can continue to read program memory, regardless of the protection bit settings. Writing the program memory is dependent upon the write protection setting. See Section 12.3 “Write Protection” for more information. 12.3 Write Protection Write protection allows the device to be protected from unintended self-writes. Applications, such as bootloader software, can be protected while allowing other regions of the program memory to be modified. The WRT<1:0> bits in the Configuration Word define the size of the program memory block that is protected. 12.4 ID Locations Four memory locations (2000h – 2003h) are designated as ID locations where the user can store checksum or other code identification numbers. These locations are not accessible during normal execution but are readable and writable during Program/Verify mode. Only the Least Significant 7 bits of the ID locations are reported when using MPLAB Integrated Development Environment (IDE). 12.5 Device ID and Revision ID The memory location 2006h is where the Device ID and Revision ID are stored. The upper nine bits hold the Device ID. The lower five bits hold the Revision ID. Development tools, such as device programmers and debuggers, may be used to read the Device ID and Revision ID. REGISTER 12-2: DEVICEID: DEVICE ID REGISTER(1) RR R R R R DEV<8:3> bit 13 bit 8 RR R R R R R R DEV<2:0> REV<4:0> bit 7 bit 0 Legend: R = Readable bit P = Programmable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 13-5 DEV<8:0>: Device ID bits bit 4-0 REV<4:0>: Revision ID bits These bits are used to identify the revision. Note 1: This location cannot be written. Device DEVICEID<13:0> Values DEV<8:0> REV<4:0> MCP19111 10 1111 100 x xxxx |
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