68HC908RF datasheet(32/188 Pages) MOTOROLA

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Memory

Data Sheet

MC68HC908RF2 — Rev. 4.0

Memory

MOTOROLA

2.5.4 FLASH 2TS Program/Margin Read Operation

NOTE:

After a total of eight program operations have been applied to a row, the row must

be erased before further programming to avoid program disturb. An erased byte

will read $00.

The FLASH 2TS memory is programmed on a page basis. A page consists of one

byte. The smart programming algorithm (Figure 2-4) is recommended to program

every page in the FLASH 2TS memory.

The embedded smart programming algorithm uses this step-by-step sequence to

program the data into the FLASH memory. The algorithm optimizes the time

required to program each page. Refer to 2.5.7 Embedded Program/Erase

Routines for information on utilizing embedded routines.

Set the FDIV bits. These bits determine the charge pump frequency.

Set PGM = 1. This configures the memory for program operation and

enables the latching of address and data for programming.

Read the FLASH 2TS block protect register (FLBPR).

Write data to the one byte being programmed.

Set HVEN = 1.

Wait for a time, tStep.

Set HVEN = 0.

Wait for a time, tHVTV.

Set MARGIN = 1.

10.

Wait for a time, tVTP.

11.

Set PGM = 0.

12.

Wait for a time, tHVD.

13.

Read back data in margin read mode. This read operation is stretched by

eight cycles.

14.

Clear the MARGIN bit. If the margin read data is identical to

write data, the program operation is complete; otherwise, jump to step 2.

NOTE:

While these operations must be performed in the order shown, other unrelated

operations may occur between the steps.

The smart programming algorithm guarantees the minimum possible program

time.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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