mc9s08gt16a Freescale Semiconductor, Inc, mc9s08gt16a Datasheet - Page 59

• Manufacturer Part Number: mc9s08gt16a
• Description: Hcs08 Microcontrollers 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

1
4.6.5
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 discussed in the bit
descriptions.
Freescale Semiconductor
Background commands can be used to change the contents of these bits in FPROT.
FPS[7:1]
Reset
Reset
FCBEF
FPDIS
FCCF
Field
Field
7:1
0
7
6
W
W
R
R
Note
FCBEF
FLASH Status Register (FSTAT)
FPS7
FLASH Protect Select Bits — When FPDIS = 0, this 7-bit field determines the ending address of unprotected
FLASH locations at the high address end of the FLASH. Protected FLASH locations cannot be erased or
programmed.
FLASH Protection Disable
0 FLASH block specified by FPS2:FPS0 is block protected (program and erase not allowed).
1 No FLASH block is protected.
FLASH Command Buffer Empty Flag — The FCBEF bit is used to launch commands. It also indicates that the
command buffer is empty so that a new command sequence can be executed when performing burst
programming. The FCBEF bit is cleared by writing a 1 to it or when a burst program command is transferred to
the array for programming. Only burst program commands can be buffered.
0 Command buffer is full (not ready for additional commands).
1 A new burst program command may be written to the command buffer.
FLASH Command Complete Flag — FCCF is set automatically when the command buffer is empty and no
command is being processed. FCCF is cleared automatically when a new command is started (by writing 1 to
FCBEF to register a command). Writing to FCCF has no meaning or effect.
0 Command in progress
1 All commands complete
1
7
7
(1)
= Unimplemented or Reserved
Note
FCCF
FPS6
1
6
6
(1)
This register is loaded from nonvolatile location NVPROT during reset.
Figure 4-8. FLASH Protection Register (FPROT)
Figure 4-9. FLASH Status Register (FSTAT)
Table 4-10. FPROT Field Descriptions
Table 4-11. FSTAT Field Descriptions
MC9S08GT16A/GT8A Data Sheet, Rev. 1
FPVIOL
Note
FPS5
0
5
5
(1)
FACCERR
Note
FPS4
0
4
4
(1)
Description
Description
Note
FPS3
3
3
0
0
(1)
FBLANK
Note
FPS2
0
2
2
(1)
Note
FPS1
0
0
1
1
(1)
Note
FPDIS
Memory
0
0
0
0
(1)
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