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MC908QC8CDRE Datasheet(PDF) 43 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QC8CDRE
Descripción  M68HC08 Microcontrollers
Descarga  274 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QC8CDRE Datasheet(HTML) 43 Page - Freescale Semiconductor, Inc

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FLASH Memory (FLASH)
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 5
Freescale Semiconductor
43
For EEPROM emulation software to work successfully, the following items must be taken care of in the
user software:
1.
Each FLASH byte in a page must be programmed only one time until the page is erased.
2.
A page must be erased before the FLASH cumulative program HV period (tHV) is beyond the
maximum tHV. tHV is defined as the cumulative high-voltage programming time to the same row
before the next erase. For more detailed information, refer to 19.17 Memory Characteristics.
3.
FLASH row erase and program cycles should not exceed 10,000 cycles, respectively.
The above EEPROM emulation software can be easily developed by using the on-chip FLASH routines
implemented in the MCU. These routines are located in the ROM memory and support FLASH program
and erase operations. Proper utilization of the on-chip FLASH routines guarantee conformance to the
FLASH specifications.
In the on-chip FLASH programming routine called PRGRNGE, the high-voltage programming time is
enabled for less than 125
µs when programming a single byte at any operating bus frequency between
1.0 MHz and 8.4 MHz. Therefore, even when a row is programmed by 32 separate single-byte
programming operations, tHV is less than the maximum tHV. Hence, item 2 listed above is already taken
care of by using this routine.
A page erased operation is provided in the FLASH erase routine called ERARNGE.
Application note AN2635 (On-Chip FLASH Programming Routines) describes how to use these routines.
The following application notes, available at www.freescale.com, describe how EERPOM emulation is
implemented using FLASH:
AN2183 — Using FLASH as EEPROM on the MC68HC908GP32
AN2346 — EEPROM Emulation Using FLASH in MC68HC908QY/QT MCUs
AN2690 — Low Frequency EEPROM Emulation on the MC68HC908QY4
An EEPROM emulation driver, available at www.freescale.com, has been developed and qualified:
AN3040 — M68HC08 EEPROM Emulation Driver


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