| 翻訳と辞書 |
Intel 8253
The Intel 8253 and 8254 are Programmable Interval Timers (PITs), which perform timing and counting functions. They were primarily designed for the Intel 8080/8085-processors, but later used in x86-systems. They (or an equivalent circuit embedded in a larger chip) are found in all IBM PC compatibles.
== History ==
The 8253 was used in IBM PC compatibles since their introduction in 1981.〔(【引用サイトリンク】title=Guidelines For Providing Multimedia Timer Support )〕 In modern times, this PIT is not included as a separate chip in an x86 PC. Rather, its functionality is included as part of the motherboard's southbridge chipset. In some modern chipsets, this change may show up as measurable timing differences in accessing a PIT using the x86 I/O address space. Reads and writes to such a PIT's registers in the I/O address space may complete much faster.
Newer motherboards also include a counter through the Advanced Configuration and Power Interface (ACPI), a counter on the Local Advanced Programmable Interrupt Controller (Local APIC), and a High Precision Event Timer. The CPU itself also provides the Time Stamp Counter (TSC) facility.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Intel 8253」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|