7.5.5 FMPPE0 to FMPPE15 Registers (Offset = 0x400 to 0x43C) [reset = 0xFFFFFFFF]

Flash Memory Protection Program Enable 0 (FMPPE0), offset 0x400

Flash Memory Protection Program Enable 1 (FMPPE1), offset 0x404

Flash Memory Protection Program Enable 2 (FMPPE2), offset 0x408

Flash Memory Protection Program Enable 3 (FMPPE3), offset 0x40C

Flash Memory Protection Program Enable 4 (FMPPE4), offset 0x410

Flash Memory Protection Program Enable 5 (FMPPE5), offset 0x414

Flash Memory Protection Program Enable 6 (FMPPE6), offset 0x418

Flash Memory Protection Program Enable 7 (FMPPE7), offset 0x41C

Flash Memory Protection Program Enable 8 (FMPPE8), offset 0x420

Flash Memory Protection Program Enable 9 (FMPPE9), offset 0x424

Flash Memory Protection Program Enable 10 (FMPPE10), offset 0x428

Flash Memory Protection Program Enable 11 (FMPPE11), offset 0x42C

Flash Memory Protection Program Enable 12 (FMPPE12), offset 0x430

Flash Memory Protection Program Enable 13 (FMPPE13), offset 0x434

Flash Memory Protection Program Enable 14 (FMPPE14), offset 0x438

Flash Memory Protection Program Enable 15 (FMPPE15), offset 0x43C

This register stores the execute-only protection bits for each 2KB flash block (FMPREn stores the read-only protection bits). Since the memory is two-way interleaved and each bank individually is an 8KB sector, read-only protection must occur across a block size of 16KB. No smaller block size is supported. Note that the Flash Memory Protection Read (FMPREn) registers do allow read-protection of a block as small as 2KB, unlike the FMPPEn registers.

Thus, in order to execute-only protect a 16KB block, a user must program the entire eight bits of the byte to the same value. For example, to protect the first 16KB block, bits [7:0] of the FMPPE0 register need to be cleared to all 0s.

This register is loaded during the power-on reset sequence. The factory settings for the FMPREn and FMPPEn registers are a value of 1 for all implemented banks. This achieves a policy of open access and programmability. This register is RW0; the user can only change the protection byte from all 1s to all 0s (and may NOT change from all 0 to all 1). The changes are not permanent until the register is committed (saved), at which point the byte change is permanent. If a byte is changed from all 1s to all 0s and not committed, it may be restored by executing a power-on reset sequence. The reset value shown only applies to power-on reset; any other type of reset does not affect this register. Once committed, the only way to restore the factory default value of this register is to perform the "Recover Locked Device" sequence detailed in the JTAG chapter. For additional information, see Section 7.2.3.4.

Each FMPPEn register controls a 64K block. For additional information, see Section 7.2.3.4.

• FMPPE0 : 0 to 64KB
• FMPPE1 : 65 to 128KB
• FMPPE2 : 129 to 192KB
• FMPPE3 : 193 to 256KB
• FMPPE4 : 257 to 320KB
• FMPPE5 : 321 to 384KB
• FMPPE6 : 385 to 448KB
• FMPPE7 : 449 to 512KB
• FMPPE8 : 513 to 576KB
• FMPPE9 : 577 to 640KB
• FMPPE10 : 641 to 704KB
• FMPPE11 : 705 to 768KB
• FMPPE12 : 769 to 832KB
• FMPPE13 : 833 to 896KB
• FMPPE14 : 897 to 960KB
• FMPPE15 : 961 to 1024KB

FMPPE is shown in Figure 7-46 and described in Table 7-48.

Return to Summary Table.