
Operating Modes and On-Chip Memory
EPROM/OTPROM
MC68HC11E Family
—
Rev. 4
Technical Data
MOTOROLA
Operating Modes and On-Chip Memory
97
ELAT
—
EPROM/OTPROM Latch Control Bit
When ELAT = 1, writes to EPROM cause address and data to be
latched and the EPROM/OTPROM cannot be read. ELAT can be
read any time. ELAT can be written any time except when PGM = 1;
then the write to ELAT is disabled.
0 = EPROM/OTPROM address and data bus configured for normal
reads
1 = EPROM/OTPROM address and data bus configured for
programming
EXCOL
—
Select Extra Columns Bit
0 = User array selected
1 = User array is disabled and extra columns are accessed at bits
[7:0]. Addresses use bits [13:5] and bits [4:0] are don
’
t care.
EXCOL can be read and written only in special modes and
always returns 0 in normal modes.
EXROW
—
Select Extra Rows Bit
0 = User array selected
1 = User array is disabled and two extra rows are available.
Addresses use bits [7:0] and bits [13:8] are don
’
t care. EXROW
can be read and written only in special modes and always
returns 0 in normal modes.
T[1:0]
—
EPROM Test Mode Select Bits
These bits allow selection of either gate stress or drain stress test
modes. They can be read and written only in special modes and
always read 0 in normal modes.
T1
T0
Function Selected
0
0
Normal mode
0
1
Reserved
1
0
Gate stress
1
1
Drain stress