8051 programmers would love to have 256 bytes of stack (8051 word is byte). But because IRAM is needed for register banks (8-32 bytes, depending on how many you

8051 programmers would love to have 256 bytes of stack (8051 word is byte). But because IRAM is needed for register banks (8-32 bytes, depending on how many you use), C library temporaries etc. you're really left with just 40-100 bytes of stack.