#include <io8051.h>
void uart_init(u32 baud) SCON = 0x50; // mode 1, 8-bit UART, receive enable TMOD
Note: Results vary with 8051 derivative and optimization level. iar embedded workbench for 8051
void uart_putchar(char c) while(!TI); // wait for transmit buffer empty TI = 0; SBUF = c;
IAR provides generic header files (like io8051.h ), but for modern 8051 variants, you should download the DFP (Device Family Pack) from the IAR website or the chip manufacturer's website. This ensures that registers like P0 , P1 , TCON , and specific SFRs have the correct addresses defined. #include <io8051
// Stack placement -D_CSTACK_SIZE=0x40 -D_IRQ_STACK_SIZE=0x20
While the 8051 architecture is decades old, it remains incredibly popular in the Internet of Things (IoT), automotive, and medical device industries due to its low cost and reliability. IAR is widely considered the "gold standard" compiler for this architecture because it generates highly optimized machine code, which is critical for 8051 chips that often have limited Flash memory and RAM. void uart_init(u32 baud) SCON = 0x50
#endif
# Compile icc8051.exe src\main.c ^ -o output\obj\main.r51 ^ --cpu=8051 ^ --memory_model=large ^ --debug ^ -I.\inc ^ -D F_CPU=11059200