Operating Modes and On-Chip Memory
Data Sheet
M68HC11E Family — Rev. 5
56
Operating Modes and On-Chip Memory
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MOTOROLA
Bit 6 — Unimplemented
Always reads 0
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.
PGM — EPROM Programming Voltage Enable Bit
PGM can be read any time and can be written only when ELAT = 1.
0 = Programming voltage to EPROM array disconnected
1 = Programming voltage to EPROM array connected
T1
T0
Function Selected
0
0
Normal mode
0
1
Reserved
1
0
Gate stress
1
1
Drain stress
F
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