Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentesRévision précédenteProchaine révision | Révision précédente | ||
back2root:ibm-pc-ms-dos:instr:clx-stx [2023/02/24 14:16] – supprimée - modification externe (Unknown date) 127.0.0.1 | back2root:ibm-pc-ms-dos:instr:clx-stx [2023/03/03 23:53] (Version actuelle) – modification externe 127.0.0.1 | ||
---|---|---|---|
Ligne 1: | Ligne 1: | ||
+ | ====== CLx / STx ====== | ||
+ | ===== Carry Flag ===== | ||
+ | |||
+ | ==== CLC - Clear Carry Flag ==== | ||
+ | |||
+ | Clears the Carry Flag. | ||
+ | |||
+ | **Usage:** | ||
+ | |||
+ | <code asm> | ||
+ | CLC | ||
+ | </ | ||
+ | |||
+ | **Modifies flags: | ||
+ | |||
+ | <WRAP round box> | ||
+ | CF | ||
+ | </ | ||
+ | |||
+ | ^ ^ | ||
+ | ^ Operands | ||
+ | | none | 2 | 2 | 2 | 2 | 1 | | ||
+ | |||
+ | |||
+ | ==== STC - Set Carry Flag ==== | ||
+ | |||
+ | Sets the Carry Flag to 1. | ||
+ | |||
+ | **Usage:** | ||
+ | |||
+ | <code asm> | ||
+ | STC | ||
+ | </ | ||
+ | |||
+ | **Modifies flags:** | ||
+ | |||
+ | <WRAP round box> | ||
+ | CF | ||
+ | </ | ||
+ | |||
+ | ^ ^ | ||
+ | ^ Operands | ||
+ | | none | 2 | 2 | 2 | 2 | 1 | | ||
+ | |||
+ | |||
+ | ===== Direction Flag ===== | ||
+ | |||
+ | ==== CLD - Clear Direction Flag ==== | ||
+ | |||
+ | Clears the Direction Flag causing string instructions to increment the SI and DI index registers. | ||
+ | |||
+ | **Usage:** | ||
+ | |||
+ | <code asm> | ||
+ | CLD | ||
+ | </ | ||
+ | |||
+ | **Modifies flags: | ||
+ | <WRAP round box> | ||
+ | DF | ||
+ | </ | ||
+ | |||
+ | ^ ^ | ||
+ | ^ Operands | ||
+ | | none | 2 | 2 | 2 | 2 | 1 | | ||
+ | |||
+ | |||
+ | ==== STD - Set Direction Flag ==== | ||
+ | |||
+ | Sets the Direction Flag to 1 causing string instructions to auto-decrement SI and DI instead of auto-increment. | ||
+ | |||
+ | **Usage:** | ||
+ | |||
+ | <code asm> | ||
+ | STD | ||
+ | </ | ||
+ | |||
+ | **Modifies flags:** | ||
+ | <WRAP round box> | ||
+ | DF | ||
+ | </ | ||
+ | |||
+ | ^ ^ | ||
+ | ^ Operands | ||
+ | | none | 2 | 2 | 2 | 2 | 1 | | ||
+ | |||
+ | ===== Interruption Flag ===== | ||
+ | |||
+ | ==== CLI - Clear Interrupt Flag ==== | ||
+ | |||
+ | Disables the maskable hardware interrupts by clearing the Interrupt flag. | ||
+ | |||
+ | <WRAP round box> | ||
+ | NMI's and software interrupts are not inhibited. | ||
+ | </ | ||
+ | |||
+ | **Usage:** | ||
+ | |||
+ | <code asm> | ||
+ | CLI | ||
+ | </ | ||
+ | |||
+ | **Modifies flags: | ||
+ | <WRAP round box> | ||
+ | IF | ||
+ | </ | ||
+ | |||
+ | |||
+ | |||
+ | ^ ^ | ||
+ | ^ Operands | ||
+ | | none | 2 | 2 | 2 | 2 | 1 | | ||
+ | |||
+ | |||
+ | ==== STI - Set Carry Flag ==== | ||
+ | |||
+ | Sets the Interrupt Flag to 1, enabling recognition of all CPU hardware interrupts. | ||
+ | |||
+ | **Usage:** | ||
+ | |||
+ | <code asm> | ||
+ | STI | ||
+ | </ | ||
+ | |||
+ | **Modifies flags:** | ||
+ | <WRAP round box> | ||
+ | IF | ||
+ | </ | ||
+ | |||
+ | ^ ^ | ||
+ | ^ Operands | ||
+ | | none | 2 | 2 | 2 | 2 | 1 | | ||
+ | |||
+ | |||
+ | {{page> |