Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentesRévision précédenteProchaine révision | Révision précédenteDernière révisionLes deux révisions suivantes | ||
back2root:ibm-pc-ms-dos:hardware:8253 [2023/01/14 15:58] – [Port 43h] frater | back2root:ibm-pc-ms-dos:hardware:8253 [2023/01/14 16:21] – [Read Back Command Status (8254 only, read from counter register)] frater | ||
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Ligne 133: | Ligne 133: | ||
==== Bits 6-7 - Counter Select Bits ==== | ==== Bits 6-7 - Counter Select Bits ==== | ||
- | + | {{tablelayout? | |
- | ^ Bits ^ ^ | + | ^ Bits ^ ^ |
- | | 00 |select counter 0| | + | | 00 | select counter 0 |
- | | 01 |select counter 1| | + | | 01 | select counter 1 |
- | | 10 |select counter 2| | + | | 10 | select counter 2 |
- | | 11 | read back command (8254 only, illegal on 8253, see below)| | + | | 11 | read back command (8254 only, **illegal on 8253**, see [[#cptread|below]]) | |
===== Read Back Command Format | ===== Read Back Command Format | ||
+ | {{anchor: | ||
^ Bit ^ Read Back Command (written to Mode Control Reg) ^ | ^ Bit ^ Read Back Command (written to Mode Control Reg) ^ | ||
| | | | ||
Ligne 153: | Ligne 154: | ||
- | ===== Read Back Command Status (8254 only, read from counter register) ====== | + | ===== Read Back Command Status (8254 only) ====== |
+ | |||
+ | Read from counter register | ||
^ Bit ^ Read Back Command Status ^ | ^ Bit ^ Read Back Command Status ^ |