MC908AB32CFUE Datasheet, PDF (74/392 Pages) Freescale Semiconductor, Inc – Microcontrollers

EEPROM
Table 5-1. EEPROM Array Address Blocks
Block Number (EEBPx)
EEBP0
EEBP1
EEBP2
EEBP3
Address Range
$0800–$087F
$0880–$08FF
$0900–$097F
$0980–$09FF
These bits are effective after a reset or a read to EENVR register. The
block protect configuration can be modified by erasing/programming the
corresponding bits in the EENVR register and then reading the EENVR
register.
5.9 EEPROM Programming and Erasing
The unprogrammed or erased state of an EEPROM bit is a logic 1. The
factory default for the EEPROM array is $FF for all bytes.
The programming operation changes an EEPROM bit from logic 1 to
logic 0 (programming cannot change a bit from logic 0 to a logic 1). In a
single programming operation, the minimum EEPROM programming
size is zero bits; the maximum is eight bits (one byte).
The erase operation changes an EEPROM bit from logic 0 to logic 1. In
a single erase operation, the minimum EEPROM erase size is one byte;
the maximum is the entire EEPROM array.
For each EEPROM byte, the write/erase endurance is 10,000 cycles.
One write/erase cycle is defined as: a maximum of eight programming
operations on the same byte followed by an erase operation of the that
byte. Therefore, it is possible to program a byte, bit by bit to logic 0
before requiring an erase on that byte.
NOTE:
Although programming a bit (from 0 or 1) with a logic 1 does not change
the state of that bit, it is still regarded as a programming operation. That
is, if the same byte is programmed eight times (with any value), that byte
must be erased before it can be successfully programmed again.
Technical Data
74
EEPROM
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor