Flash Array and Control
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
22-21
Preliminary
Figure 22-12. Program Sequence
Erase suspend
User mode read state
Write MCR
PGM = 1
Program write
Step 1
Step 2
Step 3
Write MCR
EHV = 1
High voltage active
Access MCR
DONE
Step 4
WRITE
PSUS = 1
Read MCR
DONE = 1
Program suspend
PGM = 0
User mode read state
PEG = 0
Read MCR
DONE = 1
DONE = 0
Write MCR
PSUS = 0
EHV = 1
Abort
WRITE
EHV = 0
Step 5
Step 6
PEG
Success
PEG = 1
Write MCR
Failure
PEG = 0
Step 7
EHV = 0
PGM
more words
Step 8
?
No
Yes
Write MCR
PGM = 0
User mode read state
Step 9
Go to
Step 2
Note: PEG will remain valid under this
condition until EHV is set high or
PGM is cleared.
Note: PSUS cannot be cleared while
EHV = 0. PSUS and EHV cannot
both be changed in a single
write operation.
PEG valid period
Last write
?
Yes
No
ESUS
?
0
1
Erase suspend
or erase suspend
?
value
?