NXP Semiconductors freescale semiconductor MC13211, Reference Manual

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MCU Memory
MC1321x Reference Manual, Rev. 1.6
Freescale Semiconductor 11-19
11.6.5 FLASH Status Register (FSTAT)
Bits 3, 1, and 0 always read 0 and writes have no meaning or effect. The remaining five bits are status bits
that can be read at any time. Writes to these bits have special meanings that are covered in the bit
descriptions.
Table 11-10. FPROT Field Descriptions
Field Description
7
FPOPEN
Open Unprotected FLASH for Program/Erase
0 Entire FLASH memory is block protected (no program or erase allowed).
1 Any FLASH location, not otherwise block protected or secured, may be erased or programmed.
6
FPDIS
FLASH Protection Disable
0 FLASH block specified by FPS2:FPS0 is block protected (program and erase not allowed).
1 No FLASH block is protected.
5:3
FPS[2:0]
FLASH Protect Size Selects — When FPDIS = 0, this 3-bit field determines the size of a protected block of
FLASH locations at the high address end of the FLASH (see Table 11-11 ). Protected FLASH locations cannot be
erased or programmed.
Table 11-11. High Address Protected Block
FPS2:FPS1:FPS0 Protected Address Range Protected Block Size Redirected Vectors
1,2
1
No redirection if FPOPEN = 0, or FNORED = 1.
2
Reset vector is not redirected.
0:0:0 0xFE00–0xFFFF 512 bytes 0xFDC0–0xFDFD
0:0:1 0xFC00–0xFFFF 1024 bytes 0xFBC0–0xFBFD
0:1:0 0xF800–0xFFFF 2048 bytes 0xF7C0–0xF7FD
0:1:1 0xF000–0xFFFF 4096 bytes 0xEFC0–0xEFFD
1:0:0 0xE000–0xFFFF 8192 bytes 0xDFC0–0xDFFD
1:0:1 0xC000–0xFFFF 16384 bytes 0xBFC0–0xBFFD
3
3
32K and 60K devices only.
1:1:0 0x8000–0xFFFF 32768 bytes 0x7FC0–0x7FFD
4
4
60K devices only. Note that the low flash block of 1920 bytes at 0x1080–0x17FF is not protected.
1:1:1 0x182C–0xFFFF 59,348 bytes No redirection allowed
Offset
7 6 5 4 3 2 1 0
R
FCBEF
FCCF
FPVIOL FACCERR
0 FBLANK 0 0
W
Reset 1 1 0 0 0 0 0 0
= Unimplemented or Reserved
Figure 11-8. FLASH Status Register (FSTAT)