IS200TBCIS2CCD燃機(jī)通用電氣,GE說明書在線閱讀
CPU/MPU寄存器MPU寄存器CR20保留供調(diào)試器使用。如果CR20要由用戶程序使用，必須在利用調(diào)試器資源（系統(tǒng)調(diào)用）。浮點(diǎn)支持MC88100的浮點(diǎn)特殊功能單元（SFU）187Bug支持微處理器芯片。對于MVME187BUG，命令MD、MM、RM和RS已擴(kuò)展為允許寄存器和中浮點(diǎn)數(shù)據(jù)的顯示和修改記憶力浮點(diǎn)指令可以進(jìn)行組裝和使用MD和MM命令的DI選項(xiàng)進(jìn)行分解。
IS200TBCIS2CCD燃機(jī)通用電氣以單精度或雙精度格式輸入數(shù)據(jù)時(shí)必須遵守以下規(guī)則：符號字段是第一個字段，是二進(jìn)制字段。2.指數(shù)字段是第二個字段，是十六進(jìn)制領(lǐng)域尾數(shù)字段是最后一個字段，是十六進(jìn)制字段。
4.符號字段、指數(shù)字段和至少第一位數(shù)字尾數(shù)字段必須存在（中的任何未指定數(shù)字尾數(shù)字段設(shè)置為零）。5強(qiáng)調(diào)符號和指數(shù)字段中的所有數(shù)字位置必須為目前此格式提供了輸入和顯示浮點(diǎn)十進(jìn)制數(shù)。在內(nèi)部，數(shù)字是組裝的轉(zhuǎn)換為壓縮十進(jìn)制數(shù)，然后轉(zhuǎn)換為指定的數(shù)據(jù)類型。
以這種格式輸入數(shù)據(jù)需要以下字段：有關(guān)浮點(diǎn)SFU的更多信息，請參閱MC88100 RISC微處理器用戶手冊。可選符號位（+或-）。一個小數(shù)位數(shù)后跟一個小數(shù)點(diǎn)。最多17位小數(shù)（必須至少輸入一位）?？蛇x指數(shù)字段，包括：可選下劃線。指數(shù)字段標(biāo)識符，字母“E”?？蛇x指數(shù)符號（+，-）。從1到3位小數(shù)。
CPU/MPU Registers
MPU register CR20 is reserved for usage by the debugger. If CR20
is to be used by the user program, it must be restored prior to
utilizing debugger resources (system calls).
Floating Point Support
The floating point Special Function Unit (SFU) of the MC88100
microprocessor chip is supported in 187Bug. For MVME187BUG,
the commands MD, MM, RM, and RS have been extended to allow
display and modification of floating point data in registers and in
memory. Floating point instructions can be assembled and
disassembled with the DI option of the MD and MM commands. When entering data in single or double precision format, the
following rules must be observed:
1. The sign field is the first field and is a binary field.
2. The exponent field is the second field and is a hexadecimal
field.
3. The mantissa field is the last field and is a hexadecimal field.
4. The sign field, the exponent field, and at least the first digit of
the mantissa field must be present (any unspecified digits in
the mantissa field are set to zero).
5. Each field must be separated from adjacent fields by an
underscore.
6. All the digit positions in the sign and exponent fields must be
present. This format provides a convenient way to enter and display a
floating point decimal number. Internally, the number is assembled
into a packed decimal number and then converted into a number of
the specified data type.
Entering data in this format requires the following fields:
For more information about the floating point SFU, refer to the
MC88100 RISC Microprocessor User's Manual.
An optional sign bit (+ or -).
One decimal digit followed by a decimal point.
Up to 17 decimal digits (at least one must be entered).
An optional Exponent field that consists of:
An optional underscore.
The Exponent field identifier, letter “E”.
An optional Exponent sign (+, -).
From 1 to 3 decimal digits.
