Chapter 4 Memory
MC9S08DZ128 Series Data Sheet, Rev. 1
82
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
76543210
R
FCBEF
FCCF
FPVIOL
FACCERR
0
FBLANK
0
W
Reset
11000000
= Unimplemented or Reserved
Figure 4-18. FLASH and EEPROM Status Register (FSTAT)
Table 4-21. FSTAT Register Field Descriptions
Field
Description
7
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.
6
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
register a command). Writing to FCCF has no meaning or effect.
0 Command in progress
1 All commands complete
5
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.
4
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
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.
2
FBLANK
Veried 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 veried 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).