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參數(shù)資料
| 型號(hào)： | M80287 |
| 廠商： | Intel Corp. |
| 英文描述： | 80-BIT HMOS* NUMERIC PROCESSOR EXTENSION |
| 中文描述： | 80位的保健組織*數(shù)值處理器擴(kuò)展 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 399K |
| 代理商： | M80287 |
M80287
271029–4
Figure 4. M80286/20 System Configuration
Internally the M80287 holds all numbers in the tem-
porary real format. Load instructions automatically
convert operands represented in memory as 16-,
32-, or 64-bit integers, 32- or 64-bit floating point
numbers or 18-digit packed BCD numbers into tem-
porary real format. Store instructions perform the re-
verse type conversion.
M80287 computations use the processor’s register
stack. These eight 80-bit registers provide the equiv-
alent capacity of 40 16-bit registers. The M80287
register set can be accessed as a stack, with in-
structions operating on the top one or two stack ele-
ments, or as a fixed register set, with instructions
operating on explicitly designated registers.
Table 6 lists the M80287’s instructions by class. No
special programming tools are necessary to use the
M80287 since all new instructions and data types
are directly supported by the M80286 assembler and
appropriate high level languages. All M8086/88 de-
velopment tools which support the M8087 can also
be used to develop software for the M80286 in real
address mode.
Table 3 gives the execution times of some typical
numeric instructions.
12
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