
EEPROM
EEPROM Options Register (EEOPR)
MC68HC(7)05H12
—
Rev. 1.0
General Release Specification
MOTOROLA
EEPROM
155
L
G
R
EELAT — EEPROM Programming Latch
The EELAT bit is the EEPROM programming latch enable. When
EELAT is at ‘zero’, the EER1, EER0 and EEPGM bits are reset to
zero. When the EELAT bit is clear, data can be read from the
EEPROM, and when set, this bit allows the address and data to be
latched into the EEPROM for further programming or erase operation.
Address and data can only be latched when the EEPGM bit is at
‘zero’. Reset and power-on reset, reset the EELAT bit.
EEPGM — EEPROM Programming Power Enable
EEPGM must be written to enable (or disable) the EEPGM function.
When set, EEPGM turns on the charge pump and enables the
programming (or erasing) power to the EEPROM array. When clear,
power is switched off. This enables pulsing of the programming
voltage to be controlled internally. This bit can be read at any time, but
can only be set if EELAT=1. If EELAT is not set, then EEPGM cannot
be set. EELAT=0 or reset clears the EEPGM bit.
13.4 EEPROM Options Register (EEOPR)
This register contains the secure and protect functions for the EEPROM
and allows the user to select options in a non-volatile manner. The
contents of the EEOPR register are loaded into data latches with each
power-on or external reset. The register is implemented in EEPROM,
therefore reset has no effect on the individual bits.
$0400
Bit 7
6
5
4
3
2
1
Bit 0
Read:
EEPRT
Write:
Reset:
0
0
0
0
0
0
0
0
Figure 13-2. EEPROM Options Register (EEOPR)