The compiler generates headerless STC code for all targets. Code and data are always put in separate memory areas.
The cell size is 12 bits for PDP-8, 16 bits for the 8 and 16 bit parts, and 32 bits for Thumb parts.
| TOS | SP | RP | Temporary | |
|---|---|---|---|---|
| 6502 | X | SP | A, Y | |
| 8051 | DPTR | R0 | SP | R1-R4 |
| AVR | X | Y | SP | R2-R3, Z |
| MSP430 | R5 | R4 | R1 | R6 |
| PDP-8 | AC | 10 | 11 | 5-7 |
| PIC | 22-23 | 20 | 24-25, W | |
| STM8 | X | SP | A, Y | |
| Thumb | R6 | R7 | SP | R5, LR |
All numbers are in hexadecimal, except for the PDP-8 which use octal.
| Program | Data | Data Stack | Return Stack | Temporary | |
|---|---|---|---|---|---|
| 6502 | 1000-FFFF | 0- | E0-FF | 100-1FF | 42-43 |
| 8051 | 0- | 100- | -FF | 10- | |
| AVR | 0- | 60-7F | 80-8B | 8C-9E | |
| MSP430 | F800-FFFF | 200-25F | 270-27F | 260-26F | |
| PDP-8 | 0- | 4000-5777 | 6400-6777 | 6000-6377 | |
| PIC | 0- | 28-2F | 40-4F | 30-3F | |
| STM8 | 8000- | 0-1FF | 200-2FF | 300-3FF | |
| Thumb | 0- | 20000000- | -200006FF | -200007FF |