MC68HC908AP16CFB datasheet(60/440 Pages) MOTOROLA

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FLASH Memory

Data Sheet

MC68HC908AP Family — Rev. 2.5

MOTOROLA

4.6 FLASH Program Operation

Programming of the FLASH memory is done on a row basis. A row

consists of 64 consecutive bytes starting from addresses $XX00,

$XX40, $XX80 or $XXC0. Use the following procedure to program a row

of FLASH memory. (Figure 4-3 shows a flowchart of the programming

algorithm.)

1. Set the PGM bit. This configures the memory for program

operation and enables the latching of address and data for

programming.

2. Write any data to any FLASH location within the address range of

the row to be programmed.

3. Wait for a time, tnvs (5 µs).

4. Set the HVEN bit.

5. Wait for a time, tpgs (10 µs).

6. Write data to the FLASH location to be programmed.

7. Wait for time, tprog (20 µs to 40 µs).

8. Repeat steps 6 and 7 until all bytes within the row are

programmed.

9. Clear the PGM bit.

10. Wait for time, tnvh (5 µs).

11. Clear the HVEN bit.

12. After time, trcv (1 µs), the memory can be accessed in read mode

again.

This program sequence is repeated throughout the memory until all data

is programmed.

NOTE:

The time between each FLASH address change (step 6 to step 6), or the

time between the last FLASH addressed programmed to clearing the

PGM bit (step 6 to step 9), must not exceed the maximum programming

time, tprog max.

NOTE:

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.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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