MC68HC908QY4CDW Datasheet, PDF (37/184 Pages) Freescale Semiconductor, Inc – Microcontrollers

Algorithm for Programming
a Row (32 Bytes) of FLASH Memory
1
SET PGM BIT
FLASH Memory (FLASH)
2 _{READ THE FLASH BLOCK PROTECT REGISTER}
3 _{WRITE ANY DATA TO ANY FLASH ADDRESS}
WITHIN THE ROW ADDRESS RANGE DESIRED
4
WAIT FOR A TIME, t_NVS
5
SET HVEN BIT
6
WAIT FOR A TIME, t_PGS
7 _{WRITE DATA TO THE FLASH ADDRESS}
TO BE PROGRAMMED
8
WAIT FOR A TIME, t_PROG
COMPLETED
Y
9
PROGRAMMING
THIS ROW?
N
10
CLEAR PGM BIT
11
WAIT FOR A TIME, t_NVH
NOTES:
12
The time between each FLASH address change (step 7 to step 7),
or the time between the last FLASH address programmed
to clearing PGM bit (step 7 to step 10)
13
must not exceed the maximum programming
time, t_PROG max.
This row program algorithm assumes the row/s
to be programmed are initially erased.
Figure 2-4. FLASH Programming Flowchart
CLEAR HVEN BIT
WAIT FOR A TIME, t_RCV
END OF PROGRAMMING
MC68HC908QY/QT Family Data Sheet, Rev. 6
Freescale Semiconductor
37