MC68HC912BD32 Datasheet, PDF(77/292 Page) Freescale Semiconductor, Inc – Advance Information

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MC68HC912BD32 Datasheet, PDF (77/292 Pages) Freescale Semiconductor, Inc – Advance Information

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Freescale Semiconductor, Inc.

Flash EEPROM

Operation

asserted and the ERAS bit must remain in its current state as long as

ENPE is asserted. A write to the LAT bit to clear it while ENPE is set will

be ignored. That is, after the write cycle, LAT will remain asserted.

Likewise, an attempt to change the state of ERAS will be ignored and the

state of the ERAS bit will remain unchanged.

The programming software is responsible for all timing during a program

sequence. This includes the total number of program pulses (nPP), the

length of the program pulse (tPPULSE), the program margin pulses (pm)

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

operation (tVPROG).

The erase software is responsible for all timing during an erase

sequence. This includes the total number of erase pulses (em), the

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.

9-ï¬ash

Flash EEPROM

For More Information On This Product,

Go to: www.freescale.com

MC68HC912BD32 Rev 1.0

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