Comparison Of Big Endian And Little Endian External Access - Fujitsu FR60 Hardware Manual

32-bit microcontroller mb91301 series

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CHAPTER 4 EXTERNAL BUS INTERFACE

Comparison of Big Endian and Little Endian External

This section shows a comparison of big endian and little endian external access in

word access, halfword access, and byte access for each bus width.

When data bus is connected according to examples of connecting to external devices

as shown in Sections "4.4.1 Big Endian Bus Access" and "4.4.2 Little Endian Bus

Access", all accesses become big endian for the internal register as follows.

The following figures describe big endian area and little endian area separately.

■ Word Access

Big endian mode

address: Lower 2-bit: "0"

address: "0" "2"

"0" "1" "2" "3"

(1) (2) (3) (4)

Little endian mode

address : "0"

address: "0" "2"

"0" "1" "2" "3"

(1) (2) (3) (4)