s908qc16vdse Freescale Semiconductor, Inc, s908qc16vdse Datasheet - Page 39

• Manufacturer Part Number: s908qc16vdse
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

2.6.4 FLASH Program Operation
Programming of the FLASH memory is done on a row basis. A row consists of 32 consecutive bytes
starting from addresses $XX00, $XX20, $XX40, $XX60, $XX80, $XXA0, $XXC0, or $XXE0. Use the
following step-by-step procedure to program a row of FLASH memory
Figure 2-4
This program sequence is repeated throughout the memory until all data is programmed.
Freescale Semiconductor
10. Clear the PGM bit
11. Wait for time, t
12. Clear the HVEN bit.
13. After time, t
1. The time between each FLASH address change, or the time between the last FLASH address programmed to clearing
1. Set the PGM bit. This configures the memory for program operation and enables the latching of
2. Read the FLASH block protect register.
3. Write any data to any FLASH location within the address range desired.
4. Wait for a time, t
5. Set the HVEN bit.
6. Wait for a time, t
7. Write data to the FLASH address being programmed
8. Wait for time, t
9. Repeat step 7 and 8 until all desired bytes within the row are programmed.
PGM bit, must not exceed the maximum programming time, t
address and data for programming.
shows a flowchart of the programming algorithm.
Do not program any byte in the FLASH more than once after a successful
erase operation. Reprogramming bits to a byte which is already
programmed is not allowed without first erasing the page in which the byte
resides or mass erasing the entire FLASH memory. Programming without
first erasing may disturb data stored in the FLASH.
Programming and erasing of FLASH locations cannot be performed by
code being executed from the FLASH memory. While these operations
must be performed in the order shown, other unrelated operations may
occur between the steps. Do not exceed t
Memory
RCV
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 4
PROG
NVH
, the memory can be accessed in read mode again.
NVS
PGS
Characteristics.
.
(1)
.
.
.
.
NOTE
NOTE
PROG
PROG
maximum.
(1)
.
maximum, see
19.17
FLASH Memory (FLASH)
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