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2-4
Figure 2-3 Physical Address Generation
2.3 I/O SPACE
The I/O space consists of 64K 8-bit or 32K 16-bit ports. The IN and OUT instructions address
the I/O space with either an 8-bit port address specified in the instruction, or a 16-bit port
address in the DX Register. Eight-bit port addresses are zero-extended so that A15–A8
are Low. I/O port addresses 00F8h through 00FFh are reserved. The Am186ER and
Am188ER microcontrollers provide specific instructions for addressing I/O space.
Figure 2-4 Memory and I/O Space
2.4 INSTRUCTION SET
The Am186ER and Am188ER microcontrollers use the same instruction set as the 80C186
microcontroller. An instruction can reference from zero to several operands. An operand
can reside in a register, in the instruction itself, or in memory. Specific operand addressing
modes are discussed on page 2-10.
Table 2-1 lists the instructions for the Am186ER and Am188ER microcontrollers in
alphabetical order.
The Am186™ and Am188™ Family Instruction Set Manual
, order
#21267, provides detailed information on the format and function of the following
instructions.
1 2 A 4 0
0 0 0 2 2
1 2 A 6 2
1 2 A 4
0 0 2 2
Segment
Base
Logical
Address
Shift
Left
4 Bits
Physical Address
To Memory
15 0
19 0
19 0
15
0
15 0
Offset
Memory
Space
I/O
Space
1M
64K