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C8051F300 Datasheet(PDF) 89 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 89 Page - List of Unclassifed Manufacturers |
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89 / 174 page  C8051F300/1/2/3/4/5 Rev. 2.6 89 The lock bits can always be read and cleared to logic 0 regardless of the security settings. Important note: The only means of removing a lock (write or read/write) once set is to erase the entire program memory space via a C2 Device Erase command. Figure 10.1. Flash Program Memory Map The level of Flash security depends on the Flash access method. The three Flash access methods that can be restricted are reads, writes, and erases from the C2 debug interface, user firmware executing on unlocked pages, and user firmware executing on locked pages. Accessing Flash from the C2 debug interface: 1. Any unlocked page may be read, written, or erased. 2. Locked pages cannot be read, written, or erased. 3. The page containing the Lock Byte may be read, written, or erased if it is unlocked. 4. Reading the contents of the Lock Byte is always permitted only if no pages are locked. 5. Locking additional pages (changing ‘1’s to ‘0’s in the Lock Byte) is not permitted. 6. Unlocking Flash pages (changing ‘0’s to ‘1’s in the Lock Byte) requires the C2 Device Erase com- mand, which erases all Flash pages including the page containing the Lock Byte and the Lock Byte itself. 7. The Reserved Area cannot be read, written, or erased. Table 10.2. Security Byte Decoding Bits Description 7–4 Write Lock: Clearing any of these bits to logic 0 prevents all Flash memory from being written or page-erased across the C2 interface 3–0 Read/Write Lock: Clearing any of these bits to logic 0 prevents all Flash memory from being read, written, or page-erased across the C2 interface. C8051F300/1/2/3 0x0000 0x1DFF Lock Byte Reserved 0x1DFE FLASH memory organized in 512-byte pages 0x1E00 0x0000 0x0FFF Reserved 0x0FFE FLASH memory organized in 512-byte pages 0x1000 0x0000 0x07FF Lock Byte Reserved 0x07FE FLASH memory organized in 512-byte pages 0x0800 Lock Byte C8051F304 C8051F305 |
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