Freescale Semiconductor MPC5553 - Page 552

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 13-29
Figure 13-14. Program Sequence
PEG Valid Period
Note: PEG will remain valid
under this condition until EHV
is set high or PGM is cleared.
PEG = 0
Erase Suspend
User Mode Read State
Write MCR
ProgramWrite
Write MCR
Read MCR
Write MCR
Last
Write MCR
pgm
Program Suspend
Write MCR
Abort
User Mode Read State
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7
Step 9
No
Yes
User Mode Read State
PGM = 0
EHV = 1
WRITE
DONE = 1
PSUS = 1
Yes, Go to Step 2
No
EHV = 0
PGM = 0
PSUS = 0
PGM = 1
Read MCR
DONE = 1
ESUS
Erase Suspend
PEG = 0
PEG = 1
PEG
FailureSuccess
1
0
Value
High Voltage Active
EHV = 0
DONE = 0
WRITE
Access MCR
DONE
Step 8
Note: PSUS cannot be cleared
while EHV = 0. PSUS and
EHV = 1
EHV cannot both be changed
with a single write operation.
Write?
or Erase Suspend
more
words?