Freescale Semiconductor, Inc.
EEPROM-2
7.3 Features
EEPROM-2 features include:
• Byte, block, or bulk erasable
• Non-volatile redundant array option
• Non-volatile block protection option
• Non-volatile MCU configuration bits
• On-chip charge pump for programming/erasing
• Security option
7.4 Functional Description
The 512 bytes of EEPROM-2 can be programmed or erased without an
external voltage supply. EEPROM cells are protected with a non-volatile
block protection option. These options are stored in the EEPROM
non-volatile register (EENVR2) and are loaded into the EEPROM array
configuration register after reset (EEACR2) or a read of EENVR2.
Hardware interlocks are provided to protect stored data corruption from
accidental programming/erasing.
7.4.1 EEPROM Programming
The unprogrammed state is a logic 1. Programming changes the state to
a logic 0. Only valid EEPROM bytes in the non-protected blocks and
EENVR2 can be programmed. When the array is configured in the
redundant mode, programming the first 256 bytes also will program the
last 256 bytes with the same data. Programming the EEPROM in the
non-redundant mode is recommended. Program the data to both
locations before entering redundant mode.
Technical Data
MC68HC908AS60 — Rev. 1.0
EEPROM-2
For More Information On This Product,
Go to: www.freescale.com
FREESCALE [ Freescale ]
