Support For Big Endian - Epson S5U1C17001C Manual

Cmos 16-bit single chip microcomputer, c compiler package for s1c17 family

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10.6.10 Support for Big Endian

The tools (C compiler to the linker) and libraries only support little endian. Note that the C compiler cannot create

elf files that can be loaded in big endian areas. Regarding data references, however, the debugger supports big

Method of specifying big endian (in simulator mode)

To set information about big endian areas in the debugger while in simulator mode, specify it in the map

information of a parameter file. For areas you wish to set to big endian, write B in the 5th parameter. Without

this statement, areas are assumed to be little endian. However, the S1C17 chip for which you are developing

software must be a type that supports big endian. Also note that internal ROM, RAM, and I/O cannot be set to

For details about parameter files, see Section 10.9, "Parameter Files".

Operation of debugger commands

Memory manipulating commands (x, set, c17 fg/fh/fw, c17 mvb/mvh/mvw)

These commands perform operations and display information suitable for endian format because memory is

accessed for read and write in units of bytes, 16 bits, or 32 bits according to the type of data in each command.

load command

Swaps data suitable for endian format and writes data in units of 16 bits. For this reason, programs created by

the C compiler cannot be loaded correctly in big endian areas.

(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)

S5U1C17001C ManUal