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MC68HC08JL8 Datasheet, PDF (35/212 Pages) Freescale Semiconductor, Inc – Microcontrollers
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FLASH Mass Erase Operation
7. Clear the ERASE bit.
8. Wait for a time, tnvh (5µs).
9. Clear the HVEN bit.
10. After time, trcv (1µs), the memory can be accessed in read mode again.
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 as shown, but other unrelated operations
may occur between the steps.
2.9 FLASH Mass Erase Operation
Use the following procedure to erase the entire FLASH memory:
1. Set both the ERASE bit and the MASS bit in the FLASH control register.
2. Read the FLASH block protect register.
3. Write any data to any FLASH location within the FLASH memory address range.
4. Wait for a time, tnvs (10µs).
5. Set the HVEN bit.
6. Wait for a time tmerase (4ms).
7. Clear the ERASE bit.
8. Wait for a time, tnvh1 (100µs).
9. Clear the HVEN bit.
10. After time, trcv (1µs), the memory can be accessed in read mode again.
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 as shown, but other unrelated operations
may occur between the steps.
2.10 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 this
step-by-step procedure to program a row of FLASH memory:
(Figure 2-4 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. Read the FLASH block protect register.
3. Write any data to any FLASH location within the address range of the row to be programmed.
4. Wait for a time, tnvs (10µs).
5. Set the HVEN bit.
6. Wait for a time, tpgs (5µs).
7. Write data to the FLASH address to be programmed.
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
Freescale Semiconductor
35
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