AM186ES Advanced Micro Devices, AM186ES Datasheet - Page 26

• Manufacturer Part Number: AM186ES
• Description: microcontrollers provide a low-cost/ high-performance solution for embedded system designers who wish to use the x86 architecture.
• Manufacturer: Advanced Micro Devices

Figure 2-3
2.3
Figure 2-4
2.4
2-4
Physical Address Generation
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 Am186ES and Am188ES
microcontrollers provide specific instructions for addressing I/O space.
Memory and I/O Space
INSTRUCTION SET
The instruction set used by the Am186ES and Am188ES microcontrollers is identical to
the 80C186/188 instruction set. 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 later in this section.
Table 2-1 lists the instructions for the Am186ES and Am188ES microcontrollers in
alphabetical order.
Memory
Space
1M
19
19
1
0
1
15
0
2
2
To Memory
A
0
A
4 Bits
Shift
Space
Left
I/O
4
2
6
0
2
15
15
0
2
0
1
Programming
0
0
Physical Address
0
2
64K
2
A
2
0
4
0
Segment
Offset
Base
Address
Logical