AN2156 Freescale Semiconductor / Motorola, AN2156 Datasheet - Page 25

• Manufacturer Part Number: AN2156
• Description: Programming and Erasing FLASH and EEPROM Memories on the MC68HC908AS60A/AZ60A
• Manufacturer: Freescale Semiconductor / Motorola

AN2156
MOTOROLA
NOTE:
EELAT — EEPROM Latch Control Bit
AUTO — Indication for Automatic Termination of Program/Erase Cycle
EEPGM — EEPROM Program/Erase Enable Bit
Writing logic 0s to both the EELAT and EEPGM bits with a single
instruction will only clear the EEPGM bit to allow time for the high voltage
to dissipate.
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.
When AUTO is set, EEPGM is cleared automatically after the
program/erase cycle is terminated by the internal timer.
This read/write bit enables the internal charge pump. If the EELAT bit
is set and a write to a valid EEPROM location has occurred, then the
programming/erasing voltage is applied to the EEPROM array. Reset
clears the EEPGM bit.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Buses configured for EEPROM programming/erasing
0 = Buses configured for normal read operation
1 = Automatic clear of EEPGM is enabled.
0 = Automatic clear of EEPGM is disabled.
1 = EEPROM programming/erasing power switched on
0 = EEPROM programming/erasing power switched off
X = don’t care
EEBPx
Table 4. EEPROM Program/Erase Mode Select
0
0
0
0
1
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EERAS1
X
0
0
1
1
EEPROM Control and Configuration Registers
EERAS0
X
0
1
0
1
No erase/program
Byte program
Block erase
Byte erase
Bulk erase
MODE
Application Note
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