Datasheet

Flash Memory
Flash EEPROM Registers
MC68HC912DT128A — Rev 4.0 Technical Data
MOTOROLA Flash Memory 117
fixed 32K Flash EEPROM array 11FEE32K. In expanded modes, the
Flash EEPROM arrays are turned off. See Operating Modes.
8.6 Flash EEPROM Registers
Each 32K byte Flash EEPROM module has a set of registers. The
register space $00F4-$00F7 is in a register space window of four pages.
Each register page of four bytes maps the register space for each Flash
module and each page is selected by the PPAGE register. See
Resource Mapping
In normal modes the LOCK bit can only be written once after reset.
LOCK — Lock Register Bit
0 = Enable write to FEEMCR register
1 = Disable write to FEEMCR register
This register controls the operation of the Flash EEPROM array.
BOOTP cannot be changed when the LOCK control bit in the
FEELCK register is set or if HVEN or PGM or ERAS in the FEECTL
register is set.
FEELCK — Flash EEPROM Lock Control Register $00F4
Bit 7 6 5 4 3 2 1 Bit 0
0 0 0 0 0 0 0 LOCK
RESET: 0 0 0 0 0 0 0 0
FEEMCR — Flash EEPROM Module Configuration Register $00F5
Bit 7 6 5 4 3 2 1 Bit 0
0 0 0 0 0 0 0 BOOTP
RESET: 0 0 0 0 0 0 0 1
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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