MC908AS60ACFU Datasheet, PDF (78/414 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

EEPROM-1 Memory
6.5 EEPROM-1 Register Descriptions
Four I/O registers and three nonvolatile registers control program, erase and options of the EEPROM-1
array.
6.5.1 EEPROM-1 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 6-2. EEPROM-1 Control Register (EE1CR)
Bit 0
EEPGM
0
Bit 7— Unused bit
This read/write bit is software programmable but has no functionality.
EEOFF — EEPROM-1 power down
This read/write bit disables the EEPROM-1 module for lower power consumption. Any attempts to
access the array will give unpredictable results. Reset clears this bit.
1 = Disable EEPROM-1 array
0 = Enable EEPROM-1 array
EERAS1 and EERAS0 — Erase/Program Mode Select Bits
These read/write bits set the erase modes. Reset clears these bits.
Table 6-3. EEPROM-1 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-1 Latch Control
This read/write bit latches the address and data buses for programming the EEPROM-1 array. EELAT
cannot be cleared if EEPGM is still set. Reset clears this bit.
1 = Buses configured for EEPROM-1 programming or erase operation
0 = Buses configured for normal operation
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
78
Freescale Semiconductor