MC9S08JM60_09 Datasheet, PDF (62/388 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Chapter 4 Memory
Table 4-11. FPROT Register Field Descriptions
Field
Description
7:1
FPS[7:1]
0
FPDIS
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 FPS[7:1] is block protected (program and erase not allowed).
1 No flash block is protected.
4.7.5 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 discussed in the bit
descriptions.
7
6
5
4
3
2
1
0
R
FCCF
0
FBLANK
0
0
FCBEF
FPVIOL FACCERR
W
Reset
1
1
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 4-9. Flash Status Register (FSTAT)
Table 4-12. FSTAT Register Field Descriptions
Field
7
FCBEF
6
FCCF
5
FPVIOL
Description
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 one 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
Protection Violation Flag — FPVIOL is set automatically when FCBEF is cleared to register a command that
attempts to erase or program a location in a protected block (the erroneous command is ignored). FPVIOL is
cleared by writing a 1 to FPVIOL.
0 No protection violation.
1 An attempt was made to erase or program a protected location.
MC9S08JM60 Series Data Sheet, Rev. 3
62
Freescale Semiconductor