Zilog Z8F0130 - Manual (Page 231)

UM013037-1212 Char and Short Enumerations
Zilog Developer Studio II – Z8 Encore!
User Manual
207
char ch1 _At 0xef0;
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char ch2 _At …;
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char ch3 _At …;
This places ch1 at address 0xef0 , c h2 at the next address ( 0xef1 ) after ch1 , and ch3 at
the next address ( 0xef2 ) after ch2 . The _At … directive can only be used after a previous
_At or _Align directive.
Alignment of a Variable
The following syntax can be used to declare a global or static variable aligned at a speci-
fied alignment:
char ch2 _Align 2; // ch2 is aligned at even boundary

char ch4 _Align 4; // ch4 is aligned at a four byte boundary
Only aligned variables with the rom storage class specifier can be initialized. The aligned
variables with the near and far storage class specifiers cannot be initialized. The unini-
tialized aligned variables are not initialized to zero by the compiler start-up routine.
Char and Short Enumerations
The enumeration data type is defined as int as per ANSI C. The C-Compiler provides
language extensions to specify the enumeration data type to be other than int to save
space. The following syntax is provided by the C-Compiler to declare them as char or
short :
char enum

{
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RED = 0,
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YELLOW,
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BLUE,

INVALID
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} color;
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short enum
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{
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NEW= 0,
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OPEN,
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FIXED,
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VERIFIED,

CLOSED
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} status;

Note: