Boot Block Code Protection Bit

[loupan]

If I understand the data sheet for the 18f8722, there are 2 code protection bits that seem to overlap:

bit 6 CPB: Boot Block Code Protection bit
1 = Boot block (000000-0007FFh) not code-protected
0 = Boot block (000000-0007FFh) code-protected

An then bit 0 of the CPn bits (CP0):

bit 7 CP7: Code Protection bit(1)
1 = Block 7 (01C000-01FFFFh) not code-protected
0 = Block 7 (01C000-01FFFFh) code-protected
bit 6 CP6: Code Protection bit(1)
1 = Block 6 (01BFFF-018000h) not code-protected
0 = Block 6 (01BFFF-018000h) code-protected
bit 5 CP5: Code Protection bit(2)
1 = Block 5 (014000-017FFFh) not code-protected
0 = Block 5 (014000-017FFFh) code-protected
bit 4 CP4: Code Protection bit(2)
1 = Block 4 (010000-013FFFh) not code-protected
0 = Block 4 (010000-013FFFh) code-protected
bit 3 CP3: Code Protection bit(3)
1 = Block 3 (00C000-00FFFFh) not code-protected
0 = Block 3 (00C000-00FFFFh) code-protected
bit 2 CP2: Code Protection bit
1 = Block 2 (008000-00BFFFh) not code-protected
0 = Block 2 (008000-00BFFFh) code-protected
bit 1 CP1: Code Protection bit
1 = Block 1 (004000-007FFFh) not code-protected
0 = Block 1 (004000-007FFFh) code-protected
bit 0 CP0: Code Protection bit
1 = Block 0 (000800, 001000 or 002000(4)-003FFFh) not code-protected
0 = Block 0 (000800, 001000 or 002000(4)-003FFFh) code-protected



Are these one and the same? I realize that CP0 has to also use the fuse that sets the size associated with CP0 (4K, 2K, or 1K), but assuming I set it to 1K, do these two configuration bits do the same thing?

Thanks for any help.

[PCM programmer]

They are not the same, because Block 0 protection (CP0) starts at a
minimum address of 0x800. The Boot Block protection (CPB) always
start at address 0x0000 (and ends at 0x7FF).

[loupan]

Thanks PCM Programmer!