HCS08 datasheet(48/198 Pages) NXP

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Chapter 4 Memory Map and Register Definition

MC9S08QD4 Series MCU Data Sheet, Rev. 6

Freescale Semiconductor

4.7.5

Flash Status Register (FSTAT)

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 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 can 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.

FACCERR

Access Error Flag — FACCERR is set automatically when the proper command sequence is not obeyed exactly

(the erroneous command is ignored), if a program or erase operation is attempted before the FCDIV register has

been initialized, or if the MCU enters stop while a command was in progress. For a more detailed discussion of

the exact actions that are considered access errors, see Section 4.5.5, “Access Errors.” FACCERR is cleared by

writing a 1 to FACCERR. Writing a 0 to FACCERR has no meaning or effect.

0 No access error.

1 An access error has occurred.

FBLANK

Flash Verified as All Blank (erased) Flag — FBLANK is set automatically at the conclusion of a blank check

command if the entire flash array was verified to be erased. FBLANK is cleared by clearing FCBEF to write a new

valid command. Writing to FBLANK has no meaning or effect.

0 After a blank check command is completed and FCCF = 1, FBLANK = 0 indicates the flash array is not

completely erased.

1 After a blank check command is completed and FCCF = 1, FBLANK = 1 indicates the flash array is completely

erased (all 0xFF).

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