MC9S08DZ96F2CLL datasheet(82/458 Pages) FREESCALE

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Chapter 4 Memory

MC9S08DZ128 Series Data Sheet, Rev. 1

Freescale Semiconductor

4.6.11.5

FLASH and EEPROM Status Register (FSTAT)

4.6.11.6

FLASH and EEPROM Command Register (FCMD)

Only six command codes are recognized in normal user modes, as shown in Table 4-22. All other

command codes are illegal and generate an access error. Refer to Section 4.6.3, “Program and Erase

76543210

FCBEF

FCCF

FPVIOL

FACCERR

FBLANK

Reset

11000000

= Unimplemented or Reserved

Figure 4-18. FLASH and EEPROM Status Register (FSTAT)

Table 4-21. FSTAT Register Field Descriptions

Field

Description

FCBEF

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

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

0 Command in progress

1 All commands complete

FPVIOL

Protection Violation Flag — FPVIOL is set automatically when 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 4.6.6, “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

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

if the entire FLASH or EEPROM 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 or EEPROM

array is not completely erased.

1 After a blank check command is completed and FCCF = 1, FBLANK = 1 indicates the FLASH or EEPROM

array is completely erased (all 0xFFFF).

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