Engineering Bulletin

EB381

6

MOTOROLA

Case 1

Example:

RAM

Issue:

None

Change required: None. However, you may want to take advantage

of the extra 768 bytes of RAM. This block of RAM

is also relocatable on 4-K boundaries in the

64-Kbyte address space by writing an appropriate

value into bits 4–7 in the INIT register.

Case 2

Example:

EPROM

Issue:

The MC68HC11F1 has less EEPROM (512 bytes

vs. 2048 bytes), and it is located at a different

starting address ($FE00 vs. $F800).

Change required: Change code to use new EEPROM block located

from $FE00 to $FFDF.

Case 3

Example:

External address range

Issue:

External address range is different.

Change required: Change the external address range from

$1040–$F7FF to $1060–$FDFF.

Case 4

Example:

Register block

Issue:

Register block is a different size and some register

addresses have different meanings.

Change required: The register block on the MC68HC11F1 is

96 bytes instead of 64-bytes and is located at a

default location of $1000–$105F. This block of

RAM is also re-locatable on 4-K boundaries in the

64-Kbyte address space by writing to bits 0–3 in

the INIT register. These register addresses also

have different meanings: $1001, $1002, $1003,

$1005, $1006, $1036, $1038, and $103E.

$105C–$105F are additional registers.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com