Mikroelektronika MIKROE-742 데이터 시트

Note: If none of the memory specifiers are used when declaring a variable, data specifier will be
set as default by the compiler. 

Related topics: AVR Memory Organization, Accessing individual bits, SFRs, Constants, Functions 

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 4

This memory specifier allows user to access the I/O Memory space.

// put io_buff in io memory space
var io_buff : byte; io;

This memory specifier in combination with (rx, io, data) allows user to access
special function registers. It also instructs compiler to maintain same identifier in
Pascal and assembly.

var io_buff : byte; io; sfr;  // put io_buff in I/O memory space
var y : char; rx; sfr;

// puts y in Rx space

var temp : byte; data; sfr; and var temp : byte; sfr; are equiv-
alent, and put temp in Extended I/O Space.

If no other memory specifier is used (rx, io, sfr, code or data), the register
specifer places variable in Rx space, and instructs compiler to maintain same
identifier in C and assembly.

var y : char; register;