C8051F007 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051F007

Mixed-Signal 32KB ISP FLASH MCU Family

Silicon Laboratories 

C8051F000/1/2/5/6/7

C8051F010/1/2/5/6/7

Figure 11.2. Flash Program Memory Security Bytes

Program Memory

Space

(This Block locked only if all

other blocks are locked)

Reserved

Read Lock Byte

Write/Erase Lock Byte

0x807F

0x8000

0x7FFF

0x7E00

0x7DFF

0x7DFE

0x7DFD

Software Read Limit

0x0000

Read and Write/Erase Security Bits.

(Bit 7 is MSB.)

Bit Memory Block

7 0x7000 - 0x7DFD

6 0x6000 - 0x6FFF

5 0x5000 - 0x5FFF

4 0x4000 - 0x4FFF

3 0x3000 - 0x3FFF

2 0x2000 - 0x2FFF

1 0x1000 - 0x1FFF

0 0x0000 - 0x0FFF

FLASH Read Lock Byte

Bits7-0: Each bit locks a corresponding block of memory. (Bit 7 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.

FLASH Access Limit Register (FLACL)

The content of this register is used as the high byte of the 16-bit software read limit address. The 16-

bit read limit address value is calculated as 0xNN00 where NN is replaced by the contents of this

register. Software running at or above this address is prohibited from using the MOVX or MOVC

instructions to read, write, or erase, locations below this address. Any attempts to read locations

below this limit will return the value 0x00.

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. However, 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). NOTE: 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

non-security byte in the 0x7C00-0x7DFF page is addressed during erasure, only that page (including the

security bytes) will be erased.

The Flash Access Limit security feature (see Figure 11.3) protects proprietary program code and data from being

read by software running on the C8051F005/06/07/15/16/17 MCUs. This feature provides support for OEMs that

wish to program the MCU with proprietary value-added firmware before distribution. The value-added firmware

can be protected while allowing additional code to be programmed in remaining program memory space later.

89

Rev. 1.7

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