MC908AZ32ACFUE Datasheet, PDF (57/324 Pages) Freescale Semiconductor, Inc – Microcontrollers

EEPROM Register Descriptions
5.5 EEPROM Register Descriptions
Four I/O registers and three nonvolatile registers control program, erase and options of the EEPROM
array.
5.5.1 EEPROM Control Register
This read/write register controls programming/erasing of the array.
Address: $FE1D
Bit 7
Read:
UNUSED
Write:
Reset: 0
6
5
0
EEOFF
0
0
= Unimplemented
4
3
EERAS1 EERAS0
0
0
2
EELAT
0
1
AUTO
0
Figure 5-2. EEPROM Control Register (EECR)
Bit 0
EEPGM
0
Bit 7— Unused bit
This read/write bit is software programmable but has no functionality.
EEOFF — EEPROM power down
This read/write bit disables the EEPROM module for lower power consumption. Any attempts to
access the array will give unpredictable results. Reset clears this bit.
1 = Disable EEPROM array
0 = Enable EEPROM array
EERAS1 and EERAS0 — Erase/Program Mode Select Bits
These read/write bits set the erase modes. Reset clears these bits.
Table 5-3. EEPROM Program/Erase Mode Select
EEBPx
0
0
0
0
1
X = don’t care
EERAS1
0
0
1
1
X
EERAS0
0
1
0
1
X
MODE
Byte Program
Byte Erase
Block Erase
Bulk Erase
No Erase/Program
EELAT — EEPROM Latch Control
This read/write bit latches the address and data buses for programming the EEPROM array. EELAT
cannot be cleared if EEPGM is still set. Reset clears this bit.
1 = Buses configured for EEPROM programming or erase operation
0 = Buses configured for normal operation
MC68HC908AZ32A Data Sheet, Rev. 2
Freescale Semiconductor
57