Zilog ZUSBOPTS Uživatelský manuál stáhnout pdf (Strana 189)

100

101

UM017105-0511 Language Extensions

Zilog Developer Studio II – ZNEO™

User Manual

161

Pointer Conversions

A pointer to a qualified space type can be converted to a different qualified space type as

shown in Table 12.

Memory Models

The ZNEO C-Compiler provides two memory models:

•

Small memory model

•

Large memory model

Each of these two models is described in this section.

Small Memory Model

In the small memory model, global variables are allocated in RAM address space. The

address of these variables is 16 bits. The locals and parameters are allocated on the

stack which is located in RAM address space. The address of a local or parameter is a

16-bit address. The global variables can be manually placed into the ERAM, ROM, or

EROM address space by using the

_Far, _Rom, and _Erom address specifiers, respec-

Table 12. Pointer Conversion*

Destination

Source

unqualified const volatile _Near _Far _Rom _Erom

unqualified v W W v L v L

const v vWvLvL

volatile v W v v L v L

_Near S WS WS v X v X

_Far vWWvvvL

_Rom S WS WS v X v X

_Erom vWWvvvv

Notes:

1. v represents Valid.

2. W represents Warning.

3. S represents Valid in Small Model (Error in Large Model).

4. L represents Valid in Large Model (Error in Small Model).

5. WS represents Warning in Small Model (Error in Large Model).

6. WL represents Warning in Large Model (Error in Small Model).

7. X represents Error.

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