Zilog ZUSBOPTS Bedienungsanleitung PDF herunterladen (Seite 186)

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Language Extensions UM017105-0511

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Zilog Developer Studio II – ZNEO™

User Manual

_Near

The variable with the _Near storage specifier is allocated in the 16-bit addressable near

RAM address space. This space corresponds to the RAM assembler address space defined

in the linker address space project settings. These variables lie within the 16-bit address

range

8000-BFFF, which is the 32-bit range FF_8000-FF_BFFF.

For example:

_Near int ni; /* ni is placed in RAM address space */

In the ZNEO compiler, the peripheral registers (16-bit address: C000-FFFF and 32-bit

address:

FF_C000-FF_FFFF) are also mapped to the _Near storage specifier, and no sep-

arate keyword is provided.

For example:

#define T0CTL0 (*(unsigned char volatile _Near*)0xE306)

T0CTL0 = 0x12;

_Rom

The variable with the _Rom storage specifier is allocated in the space corresponding to the

ROM assembler address space, which is defined in the linker address space project set-

tings. These variables lie within the 16- or 32-bit addressable range

0000-7FFF. The

lower portion of this address space is used for Flash option bytes and interrupt vector

table.

Figure 126. ZNEO C-Compiler Memory Layout

_Far

_Near

_Erom

_Rom

1 2 ... 181 182 183 184 185 186 187 188 189 190 191 ... 519 520

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