MC68HC912D60 Datasheet, PDF(108/432 Page) Freescale Semiconductor, Inc – M68HC12 Microcontrollers

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MC68HC912D60 Datasheet, PDF (108/432 Pages) Freescale Semiconductor, Inc – M68HC12 Microcontrollers

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Flash Memory

Freescale Semiconductor, Inc.

length of the erase pulse (tEPULSE), the erase margin pulse or pulses,

and the delay between turning off the high voltage and verifying the

operation (tVERASE).

Software also controls the supply of the proper program/erase voltage to

the VFP pin, and should be at the proper level before ENPE is set during

a program/erase sequence.

A program/erase cycle should not be in progress when starting another

program/erase, or while attempting to read from the array.

NOTE:

Although clearing ENPE disables the program/erase voltage (VFP) from

the VFP pin to the array, care must be taken to ensure that VFP is at VDD

whenever programming/erasing is not in progress. Not doing so could

damage the part. Ensuring that VFP is always greater or equal to VDD

can be accomplished by controlling the VFP power supply with the

programming software via an output pin. Alternatively, all programming

and erasing can be done prior to installing the device on an application

circuit board which can always connect VFP to VDD. Programming can

also be accomplished by plugging the board into a special programming

fixture which provides program/erase voltage to the VFP pin.

7.8 Programming the Flash EEPROM

Programming the Flash EEPROM is accomplished by the following

sequence. The VFP pin voltage must be at the proper level prior to

executing step 4 the first time.

1. Apply program/erase voltage to the VFP pin.

2. Clear ERAS and set the LAT bit in the FEExxCTL register to

establish program mode and enable programming address and

data latches.

3. Write data to a valid address. The address and data is latched. If

BOOTP is asserted, an attempt to program an address in the boot

block will be ignored.

4. Apply programming voltage by setting ENPE.

5. Delay for one programming pulse (tPPULSE).

Advance Information

108

Flash Memory

For More Information On This Product,

Go to: www.freescale.com

68HC(9)12D60 â Rev 4.0

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