mc68hc908as60 Freescale Semiconductor, Inc, mc68hc908as60 Datasheet - Page 93

• Manufacturer Part Number: mc68hc908as60
• Description: Mc68hc908as60 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908AS60 — Rev. 1.0
In general, all bits should be erased before being programmed.
However, if program/erase cycling is of concern, minimize bit cycling in
each EEPROM byte. If any bit in a byte requires change from a 0 to a 1,
the byte needs to be erased before programming.
summarizes the conditions for erasing before programming
EEPROM Data To Be
Freescale Semiconductor, Inc.
b. The EEPGM bit cannot be set if the EELAT bit is cleared and a
c. Any attempt to clear both EEPGM and EELAT bits with a single
For More Information On This Product,
Programmed
Table 6-1. EEPROM Program/Erase Cycling Reduction
non-EEPROM write has occurred. This is to ensure proper
erasing sequence. Once EEPGM is set, the type of erase mode
cannot be modified. If EEPGM is set, the on-board charge pump
generates the erase voltage and applies it to the user EEPROM
array. When the EEPGM bit is cleared, the erase voltage is
removed from the array and the internal charge pump is turned
off.
instruction will only clear EEPGM. This is to allow time for removal
of high voltage from the EEPROM array.
0
0
1
1
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EEPROM-1
EEPROM Data Before
Programming
0
1
0
1
Table 6-1
Functional Description
Programming?
Erase Before
Yes
No
No
No
Technical Data
EEPROM-1