MOV fr,W |
|
| Description: | Move W into fr |
| Operation: | fr = W |
| Flags affected: | none |
| Registers affected: | fr |
| Sources referenced: | W |
| Cycles: | 1 |
| Opcode: | |
| Details: | SX Users Manual page # 89 |
| Microchip PIC syntax: | MOVWF fr |
| Notes: | |
If fr is 2 (the program counter) on the SX 18 and 28, no carry of the addition from bit 7 to bit 8 is performed. This means that computed jumps are restricted to the half page of 256 instructions from which the jump originates. Also, as far as I can tell, despite this not being documented anywhere, moving an 8 bit value to the PC results in CLEARING the 9th bit (bit 8) of the PC. So you can only do computed jumps intp the first half page of each page. Just like calls
| file: /Techref/scenix/inst/movefrw.htm, 2KB, , updated: 2001/8/8 00:00, local time: 2024/11/24 01:50,
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Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232! |
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