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NG80386SXLP33 Datasheet(PDF) 97 Page - Intel Corporation |
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NG80386SXLP33 Datasheet(HTML) 97 Page - Intel Corporation |
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97 / 102 page  Intel386TM SX MICROPROCESSOR Register Specified by reg Field During 32-Bit Data Operations reg Function of w Field (when w e 0) (when w e 1) 000 AL EAX 001 CL ECX 010 DL EDX 011 BL EBX 100 AH ESP 101 CH EBP 110 DH ESI 111 BH EDI 9233 ENCODING OF THE SEGMENT REGISTER (sreg) FIELD The sreg field in certain instructions is a 2-bit field allowing one of the four 80286 segment registers to be specified The sreg field in other instructions is a 3-bit field allowing the Intel386 SX CPU FS and GS segment registers to be specified 2-Bit sreg2 Field 2-Bit Segment sreg2 Field Register Selected 00 ES 01 CS 10 SS 11 DS 3-Bit sreg3 Field 3-Bit Segment sreg3 Field Register Selected 000 ES 001 CS 010 SS 011 DS 100 FS 101 GS 110 do not use 111 do not use 9234 ENCODING OF ADDRESS MODE Except for special instructions such as PUSH or POP where the addressing mode is pre-determined the addressing mode for the current instruction is specified by addressing bytes following the primary opcode The primary addressing byte is the ‘‘mod rm’’ byte and a second byte of addressing informa- tion the ‘‘s-i-b’’ (scale-index-base) byte can be specified The s-i-b byte (scale-index-base byte) is specified when using 32-bit addressing mode and the ‘‘mod rm’’ byte has rm e 100 and mod e 00 01 or 10 When the sib byte is present the 32-bit addressing mode is a function of the mod ss index and base fields The primary addressing byte the ‘‘mod rm’’ byte also contains three bits (shown as TTT in Figure 8-1) sometimes used as an extension of the primary op- code The three bits however may also be used as a register field (reg) When calculating an effective address either 16-bit addressing or 32-bit addressing is used 16-bit ad- dressing uses 16-bit address components to calcu- late the effective address while 32-bit addressing uses 32-bit address components to calculate the ef- fective address When 16-bit addressing is used the ‘‘mod rm’’ byte is interpreted as a 16-bit addressing mode specifier When 32-bit addressing is used the ‘‘mod rm’’ byte is interpreted as a 32-bit addressing mode specifier Tables on the following three pages define all en- codings of all 16-bit addressing modes and 32-bit addressing modes 97 |
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