HCS08 datasheet(62/374 Pages) NXP

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Chapter 4 Memory

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

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.

Table 4-11. FPROT Register Field Descriptions

Field

Description

7:1

FPS[7:1]

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.

FPDIS

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.

321

FCBEF

FCCF

FPVIOL

FACCERR

0FBLANK0

Reset

110

000

= Unimplemented or Reserved

Figure 4-9. Flash Status Register (FSTAT)

Table 4-12. FSTAT Register Field Descriptions

Field

Description

FCBEF

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.

FCCF

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

FPVIOL

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.

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