For 8051 ((link)) - Iar Embedded Workbench

#include "device.h" #include "uart.h" #define BAUDRATE_9600 0xFA // for 11.0592 MHz, timer1 auto-reload

#pragma location = "MY_SEGMENT" __xdata int my_var; // Interrupt service routine #pragma vector = 0x23 // UART interrupt vector (address 0x23) __interrupt void uart_isr(void) // no prologue/epilogue overhead if __irq

-D_DATA_START=0x0000 -D_DATA_END=0x007F

typedef unsigned char u8; typedef unsigned int u16;

It is widely used in legacy and modern embedded systems (industrial control, IoT sensors, automotive, medical devices) requiring extreme code density and real-time performance. | Feature | Description | |---------|-------------| | Compiler | Optimizing C/C++ compiler with extensive 8051-specific extensions | | Linker | Flexible segment management for near/far/idata/xdata/code memory | | Debugger | C-spy with hardware support (JTAG, SDI, ROM-monitor) | | Memory Models | Small, Medium, Compact, Large, Huge | | Bank Switching | Support for up to 2 MB code banking | | Peripheral Support | SFR (Special Function Register) definitions for 1000+ devices | | RTOS Awareness | For embOS, FreeRTOS, TI-RTOS | | Code Size | Industry-leading density (often 15–30% smaller than Keil) | 3. Memory Model Selection (Critical for 8051) The 8051 has Harvard architecture with separate memory spaces. IAR supports five memory models: iar embedded workbench for 8051

void delay_ms(u16 ms) u16 i, j; for(i = 0; i < ms; i++) for(j = 0; j < 120; j++); // approx 1ms @ 11.0592 MHz

#endif #include "device.h" #include "uart.h" __xdata u16 adc_values[100]; // stored in external RAM __data u8 led_counter = 0; // fast access in internal RAM #include "device

void uart_init(u32 baud) SCON = 0x50; // mode 1, 8-bit UART, receive enable TMOD