Datasheet

Resource Mapping

Internal Resource Mapping

MC68HC912DT128A — Rev 4.0 Technical Data

MOTOROLA Resource Mapping 91

6.3.3 EEPROM Mapping

The MC68HC912DT128A has 2K bytes of EEPROM which is activated

by the EEON bit in the INITEE register. Mapping of internal EEPROM is

controlled by four bits in the INITEE register. After reset EEPROM

address space begins at location $0800 but can be mapped to any 4K

byte boundary within the standard 64K byte address space. The

EEPROM block occupies the last 2K bytes of the 4K byte block.

EE[15:12] — Internal EEPROM map position

These bits specify the upper four bits of the 16-bit EEPROM address.

Normal modes: write once; special modes: write anytime. Read

anytime.

EEON — internal EEPROM On (Enabled)

Read or write anytime.

0 = Removes the EEPROM from the map.

1 = Places the on-chip EEPROM in the memory map at the

address selected by EE[15:12].

INITEE— Initialization of Internal EEPROM Position Register $0012

Bit 7654321Bit 0

EE15 EE14 EE13 EE12 0 0 0 EEON

RESET:00000001

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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