mc68hc05pv8a Freescale Semiconductor, Inc, mc68hc05pv8a Datasheet - Page 159

• Manufacturer Part Number: mc68hc05pv8a
• Description: Mc68hc05pv8a Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

13.4 EEPROM Options Register (EEOPR)
MC68HC(8)05PV8/A — Rev. 1.9
EELAT – EEPROM Programming Latch
EEPGM – EEPROM Programming Power Enable
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.
EEPRT – EEPROM Protect Bit
Reset:
$0180
Read:
Write:
The EELAT bit is the EEPROM programming latch enable. When
EELAT is at 0, the EER1, EER0 and EEPGM bits are reset to zero.
When the EELAT bit is clear, data can be read from the EEPROM.
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 0. STOP, reset
and power-on reset reset the EELAT bit.
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,
this power is switched off. This allows pulsing of the programming
voltage to be controlled internally. This bit can be read at any time, but
can only be written to if EELAT = 1. If EELAT is not set, then EEPGM
cannot be set. This bit is cleared by reset or when EELAT = 0.
In order to achieve a higher degree of protection, the EEPROM is split
into two 64-byte blocks. Block 1 ($0180 - $01BF) cannot be protected.
Block 2 ($01C0 - $01FF) is protected by the EEPRT bit of the options
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 13-2 EEPROM Options Register (EEOPR)
Bit 7
NA
Go to: www.freescale.com
NA
6
EEPROM
NA
5
NA
4
EEPROM Options Register (EEOPR)
NA
3
NA
2
EEPRT
NA
1
Technical Data
EEPROM
Bit 0
NA