M68HC11E Datasheet, PDF (55/268 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Operating Modes and On-Chip Memory
EPROM/OTPROM
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 EPGM = 1; then the write to ELAT is disabled.
0 = EPROM address and data bus configured for normal reads
1 = EPROM address and data bus configured for programming
For the MC68HC711E9:
a. EPGM enables the high voltage necessary for both EEPROM and
EPROM/OTPROM programming.
b. ELAT and EELAT are mutually exclusive and cannot both equal 1.
BYTE — Byte/Other EEPROM Erase Mode Bit
Refer to 2.5 EEPROM.
ROW — Row/All EEPROM Erase Mode Bit
Refer to 2.5 EEPROM.
ERASE — Erase Mode Select Bit
Refer to 2.5 EEPROM.
EELAT — EEPROM Latch Control Bit
Refer to 2.5 EEPROM.
EPGM —EPROM/OTPROM/EEPROM Programming Voltage Enable Bit
EPGM can be read any time and can be written only when ELAT = 1 (for
EPROM/OTPROM programming) or when EELAT = 1 (for EEPROM
programming).
0 = Programming voltage to EPROM/OTPROM/EEPROM array
disconnected
1 = Programming voltage to EPROM/OTPROM/EEPROM array connected
Address: $1036
Bit 7
6
5
4
3
2
Read:
MBE
Write:
ELAT EXCOL EXROW
T1
Reset: 0
0
0
0
0
0
= Unimplemented
1
Bit 0
T0
PGM
0
0
Figure 2-15. MC68HC711E20 EPROM Programming
Control Register (EPROG)
MBE — Multiple-Byte Programming Enable Bit
When multiple-byte programming is enabled, address bit 5 is considered a don’t
care so that bytes with address bit 5 = 0 and address bit 5 = 1 both get
programmed. MBE can be read in any mode and always reads 0 in normal
modes. MBE can be written only in special modes.
0 = EPROM array configured for normal programming
1 = Program two bytes with the same data
M68HC11E Family — Rev. 5
MOTOROLA
Operating Modes and On-Chip Memory
For More Information On This Product,
Go to: www.freescale.com
Data Sheet
55