Freescale Semiconductor Starter Kit for MC9S12G TRK-USB-S12G128 TRK-USB-S12G128 数据表

1000

Freescale Semiconductor

Trying to alter data in any protected area in the P-Flash memory will result in a protection violation error
and the FPVIOL bit will be set in the FSTAT register. The block erase of a P-Flash block is not possible if
any of the P-Flash sectors contained in the same P-Flash block are protected.

7

FPOPEN

Flash Protection Operation Enable — The FPOPEN bit determines the protection function for program or
erase operations as shown in

 for the P-Flash block.

0 When FPOPEN is clear, the FPHDIS and FPLDIS bits define unprotected address ranges as specified by the

corresponding FPHS and FPLS bits

1 When FPOPEN is set, the FPHDIS and FPLDIS bits enable protection for the address range specified by the

corresponding FPHS and FPLS bits

6

RNV[6]

Reserved Nonvolatile Bit — The RNV bit should remain in the erased state for future enhancements.

5

FPHDIS

Flash Protection Higher Address Range Disable — The FPHDIS bit determines whether there is a
protected/unprotected area in a specific region of the P-Flash memory ending with global address 0x3_FFFF.
0 Protection/Unprotection enabled
1 Protection/Unprotection disabled

4–3

FPHS[1:0]

Flash Protection Higher Address Size — The FPHS bits determine the size of the protected/unprotected area
in P-Flash memory as shown in

. The FPHS bits can only be written to while the FPHDIS bit is set.

2

FPLDIS

Flash Protection Lower Address Range Disable — The FPLDIS bit determines whether there is a
protected/unprotected area in a specific region of the P-Flash memory beginning with global address 0x3_8000.
0 Protection/Unprotection enabled
1 Protection/Unprotection disabled

1–0

FPLS[1:0]

Flash Protection Lower Address Size — The FPLS bits determine the size of the protected/unprotected area
in P-Flash memory as shown in

. The FPLS bits can only be written to while the FPLDIS bit is set.

1

For range sizes, refer to

.

1

1

1

No P-Flash Protection

1

1

0

Protected Low Range

1

0

1

Protected High Range

1

0

0

Protected High and Low Ranges

0

1

1

Full P-Flash Memory Protected

0

1

0

Unprotected Low Range

0

0

1

Unprotected High Range

0

0

0

Unprotected High and Low Ranges