На примере некой функции:
void ff( void )
{
static (volatile) unsigned char qq;
qq = PINC+PINE;
if( qq & 0x02)
PORTD = qq;
else
PORTA = qq;
}
Листинг:
-------- и STATIC, и VOLATILE --------------------
825 qq = PINC+PINE;
\ 00000000 B303 IN R16,0x13
\ 00000002 B111 IN R17,0x01
\ 00000004 0F10 ADD R17,R16
\ 00000006 9310.... STS ??qq,R17
826 if( qq & 0x02)
\ 0000000A .... LDI R30,LOW(??qq)
\ 0000000C .... LDI R31,(??qq) >> 8
\ 0000000E 8100 LD R16,Z
\ 00000010 FF01 SBRS R16,1
\ 00000012 C003 RJMP ??ff_0
-----------------------------------------------------------
------ без VOLATILE, просто STATIC -----------------------
825 qq = PINC+PINE;
\ 00000000 B303 IN R16,0x13
\ 00000002 B111 IN R17,0x01
\ 00000004 0F10 ADD R17,R16
\ 00000006 9310.... STS ??qq,R17
826 if( qq & 0x02)
\ 0000000A FF11 SBRS R17,1 ;!!!!!!!
\ 0000000C C002 RJMP ??ff_0 ;!!!!!!!
827 PORTD = qq;
-----------------------------
