MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 85

• Manufacturer Part Number: MC68HC08AZ60ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC08AZ60A — Rev 0.0
MOTOROLA
Original state of byte (erased)
First event is recorded by programming bit position 0
Second event is recorded by programming bit position 1
Third event is recorded by programming bit position 2
Fourth event is recorded by programming bit position 3
Events five through eight are recorded in a similar fashion
The erase operation changes an EEPROM-2 bit from logic 0 to logic 1.
In a single erase operation, the minimum EEPROM-2 erase size is one
byte; the maximum is the entire EEPROM-2 array.
The EEPROM-2 can be programmed such that one or multiple bits are
programmed (written to a logic 0) at a time. However, the user may never
program the same bit location more than once before erasing the entire
byte. In other words, the user is not allowed to program a logic 0 to a bit
that is already programmed (bit state is already logic 0).
For some applications it might be advantageous to track more than 10K
events with a single byte of EEPROM-2 by programming one bit at a
time. For that purpose, a special selective bit programming technique is
available. An example of this technique is illustrated in
Note that none of the bit locations are actually programmed more than
once although the byte was programmed eight times.
When this technique is utilized, a program/erase cycle is defined as
multiple program sequences (up to eight) to a unique location followed
by a single erase operation.
Table 6-2. Example Selective Bit Programming Description
Description
EEPROM-2
Program Data
1111:1101
1111:1011
1111:1110
1111:0111
in Binary
n/a
Functional Description
Advance Information
Table
6-2.
EEPROM-2
1111:1100
1111:1000
1111:0000
1111:1110
in Binary
1111:1111
Result
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