Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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C8051F120/1/2/3 C8051F124/5/6/7 Preliminary Table 15.1. FLASH Electrical Characteristics VDD = 2.7 to 3.6 V; -40°C to +85°C PARAMETER CONDITIONS MIN TYP MAX UNITS Endurance 20k 100k Erase/Write Erase Cycle Time 10 12 14 ms Write Cycle Time 40 50 60 µs 15.2. Security Options The CIP-51 provides security options to protect the FLASH memory from inadvertent modification by software as well as prevent the viewing of proprietary program code and constants. The Program Store Write Enable (PSCTL.0), Program Store Erase Enable (PSCTL.1), and Flash Write/Erase Enable (FLACL.0) bits protect the FLASH memory from accidental modification by software. These bits must be explicitly set to logic 1 before software can write or erase the FLASH memory. Additional security features prevent proprietary program code and data constants from being read or altered across the JTAG interface or by software running on the system controller. A set of security lock bytes stored at 0x1FBFF and 0x1FBFE protect the FLASH program memory from being read or altered across the JTAG interface. Each bit in a security lock-byte protects one 16k-byte block of memory. Access to the scratchpad area can only be locked by locking all other FLASH blocks. Clearing a bit to logic 0 in a Read Lock Byte prevents the corresponding block of FLASH memory from being read across the JTAG interface. Clearing a bit in the Write/Erase Lock Byte protects the block from JTAG erasures and/or writes. The Read Lock Byte is at location 0x1FBFF. The Write/Erase Lock Byte is located at 0x1FBFE. Figure 15.2 shows the location and bit definitions of the security bytes. The 1024-byte sector containing the lock bytes can be written to, but not erased by software. An attempted read of a read-locked byte returns undefined data. Debugging code in a read-locked sector is not possible through the JTAG interface. To ensure protection from external access, the block containing the lock bytes (1C000-1BFFF) must be write/erase locked by clearing the MSB of byte 0x1FBFE. Page 176 DS008-0.8-AUG02 © 2002 Cygnal Integrated Products, Inc.
Preliminary C8051F120/1/2/3 C8051F124/5/6/7 Figure 15.2. FLASH Program Memory Map and Security Bytes Read and Write/Erase Security Bits. (Bit 7 is MSB.) SFLE = 0 SFLE = 1 Bit 7 6 5 4 3 2 1 0 Memory Block 0x1C000 - 0x1FBFD 0x18000 - 0x1BFFF 0x14000 - 0x17FFF 0x10000 - 0x13FFF 0x0C000 - 0x0FFFF 0x08000 - 0x0BFFF 0x04000 - 0x07FFF 0x00000 - 0x03FFF Reserved Read Lock Byte Write/Erase Lock Byte 0x1FFFF 0x1FC00 0x1FBFF 0x1FBFE 0x1FBFD Scratchpad Memory (Data only) Program/Data Memory Space 0x00FF 0x0000 Software Read Limit 0x00000 FLASHReadLockByte Bits7-0: Each bit locks a corresponding block of memory. (Bit7 is MSB). 0: Read operations are locked (disabled) for corresponding block across the JTAG interface. 1: Read operations are unlocked (enabled) for corresponding block across the JTAG interface. FLASH Write/Erase Lock Byte Bits7-0: Each bit locks a corresponding block of memory. 0: Write/Erase operations are locked (disabled) for corresponding block across the JTAG interface. 1: Write/Erase operations are unlocked (enabled) for corresponding block across the JTAG interface. NOTE: When the highest block is locked, the security bytes may be written but not erased. FLASH access Limit Register (FLACL) The content of this register is used as the 8 MSBs of the 17-bit software read limit address. Software running at or above this address is prohibited from using the MOVX and MOVC instructions to read, write, or erase FLASH locations below this address. Any attempts to read locations below this limit will return indeterminate data. The lock bits can always be read and cleared to logic 0 regardless of the security setting applied to the block containing the security bytes. This allows additional blocks to be protected after the block containing the security bytes has been locked. Important Note: The only means of removing a lock once set is to erase the entire program memory space by performing a JTAG erase operation (i.e. cannot be done in user firmware). Addressing either security byte while performing a JTAG erase operation will automatically initiate erasure of the entire program memory space (except for the reserved area). This erasure can only be performed via JTAG. If a nonsecurity byte in the 0x1F800-0x1FBFF page is addressed during the JTAG erasure, only that page (including the security bytes) will be erased. © 2002 Cygnal Integrated Products, Inc. DS008-0.8-AUG02 Page 177
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Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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