MC9S08JM16 Datasheet, PDF (59/386 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 4 Memory
Table 4-12. FSTAT Register Field Descriptions (continued)
Field
Description
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
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.
2
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).
4.7.6 Flash Command Register (FCMD)
Only five command codes are recognized in normal user modes as shown in Table 4-14. Refer to
Section 4.5.3, “Program and Erase Command Execution,” for a detailed discussion of flash programming
and erase operations.
R
W
Reset
7
0
FCMD7
0
6
5
4
3
2
0
0
0
0
0
FCMD6
FCMD5
FCMD4
FCMD3
FCMD2
0
0
0
0
0
Figure 4-10. Flash Command Register (FCMD)
Table 4-13. FCMD Register Field Descriptions
1
0
FCMD1
0
Field
Description
FCMD[7:0] Flash Command Bits — See Table 4-14
Table 4-14. Flash Commands
Command
FCMD
Equate File Label
Blank check
Byte program
Byte program — burst mode
Page erase (512 bytes/page)
Mass erase (all flash)
0x05
0x20
0x25
0x40
0x41
mBlank
mByteProg
mBurstProg
mPageErase
mMassErase
All other command codes are illegal and generate an access error.
0
0
FCMD0
0
MC9S08JM16 Series Data Sheet, Rev. 2
Freescale Semiconductor
59