Iar Ew8051 -

| Memory | IAR keyword | Typical usage | |--------|-------------|----------------| | DATA (0–0x7F) | __data | Fast access variables | | IDATA (0–0xFF) | __idata | Indirect access | | PDATA (0–0xFF external) | __pdata | Page XDATA | | XDATA | __xdata | Large arrays/buffers | | CODE | __code | Constants, strings | | BIT | __bit | Bit variables |

Example interrupt handler:

Example:

Example conversion:

#pragma vector = 0x0B // Timer 1 interrupt __interrupt void Timer1_ISR(void) // code