IA186EM_11 Datasheet, PDF (137/146 Pages) InnovASIC, Inc – 8-Bit/16-Bit Microcontrollers

IA186EM/IA188EM
8-Bit/16-Bit Microcontrollers
Data Sheet
February 25, 2011
7.1.3 Auxiliary Field
The Auxiliary Field is defined below.
aux If mod = 11 and word = 0 If mod = 11 and word = 1
000 AL
AX
001 CL
CX
010 DL
DX
011 BL
BX
100 AH
SP
101 CH
BP
110 DH
SI
111 BH
DI
Note: When mod 11, depends on instruction.
7.1.4 r/m Field
The r/m field is defined below.
r/m Description
000 EA = (BX) + (SI) + DISP [where EA is the Effective Address]
001 EA = (BX) + (DI) + DISP
010 EA = (BP) + (SI) + DISP
011 EA = (BX) + (DI) + DISP
100 EA = (SI) + DISP
101 EA = (DI) + DISP
110 EA = (BP) + DISP [except if mod = 00, then EA = disp-high:disp-low]
111 EA = (BX) + DISP
7.1.5 Displacement
The displacement is an 8- or 16-bit value added to the offset portion of the address.
7.1.6 Immediate Bytes
The immediate bytes consist of up to 16 bits of immediate data.
7.1.7 Segment Override Prefix
The segment override prefix is configured as shown below.
7654 3 210
0 0 1 SR SR 1 1 0
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