80C186EA/80C188EA, 80L186EA/80L188EA

PCB

Function

 

PCB

Function

 

PCB

Function

 

PCB

Function

Offset

 

Offset

 

Offset

 

Offset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00H

Reserved

 

40H

Reserved

 

80H

Reserved

 

C0H

DMA0 Src. Lo

 

 

 

 

 

 

 

 

 

 

 

02H

Reserved

 

42H

Reserved

 

82H

Reserved

 

C2H

DMA0 Src. Hi

 

 

 

 

 

 

 

 

 

 

 

04H

Reserved

 

44H

Reserved

 

84H

Reserved

 

C4H

DMA0 Dest. Lo

 

 

 

 

 

 

 

 

 

 

 

06H

Reserved

 

46H

Reserved

 

86H

Reserved

 

C6H

DMA0 Dest. Hi

 

 

 

 

 

 

 

 

 

 

 

08H

Reserved

 

48H

Reserved

 

88H

Reserved

 

C8H

DMA0 Count

 

 

 

 

 

 

 

 

 

 

 

0AH

Reserved

 

4AH

Reserved

 

8AH

Reserved

 

CAH

DMA0 Control

 

 

 

 

 

 

 

 

 

 

 

0CH

Reserved

 

4CH

Reserved

 

8CH

Reserved

 

CCH

Reserved

 

 

 

 

 

 

 

 

 

 

 

0EH

Reserved

 

4EH

Reserved

 

8EH

Reserved

 

CEH

Reserved

 

 

 

 

 

 

 

 

 

 

 

10H

Reserved

 

50H

Timer 0 Count

 

90H

Reserved

 

D0H

DMA1 Src. Lo

 

 

 

 

 

 

 

 

 

 

 

12H

Reserved

 

52H

Timer 0 Compare A

 

92H

Reserved

 

D2H

DMA1 Src. Hi

 

 

 

 

 

 

 

 

 

 

 

14H

Reserved

 

54H

Timer 0 Compare B

 

94H

Reserved

 

D4H

DMA1 Dest. Lo

 

 

 

 

 

 

 

 

 

 

 

16H

Reserved

 

56H

Timer 0 Control

 

96H

Reserved

 

D6H

DMA1 Dest. Hi

 

 

 

 

 

 

 

 

 

 

 

18H

Reserved

 

58H

Timer 1 Count

 

98H

Reserved

 

D8H

DMA1 Count

 

 

 

 

 

 

 

 

 

 

 

1AH

Reserved

 

5AH

Timer 1 Compare A

 

9AH

Reserved

 

DAH

DMA1 Control

 

 

 

 

 

 

 

 

 

 

 

1CH

Reserved

 

5CH

Timer 1 Compare B

 

9CH

Reserved

 

DCH

Reserved

 

 

 

 

 

 

 

 

 

 

 

1EH

Reserved

 

5EH

Timer 1 Control

 

9EH

Reserved

 

DEH

Reserved

 

 

 

 

 

 

 

 

 

 

 

20H

Reserved

 

60H

Timer 2 Count

 

A0H

UMCS

 

E0H

Refresh Base

 

 

 

 

 

 

 

 

 

 

 

22H

End of Interrupt

 

62H

Timer 2 Compare

 

A2H

LMCS

 

E2H

Refresh Time

 

 

 

 

 

 

 

 

 

 

 

24H

Poll

 

64H

Reserved

 

A4H

PACS

 

E4H

Refresh Control

 

 

 

 

 

 

 

 

 

 

 

26H

Poll Status

 

66H

Timer 2 Control

 

A6H

MMCS

 

E6H

Reserved

 

 

 

 

 

 

 

 

 

 

 

28H

Interrupt Mask

 

68H

Reserved

 

A8H

MPCS

 

E8H

Reserved

 

 

 

 

 

 

 

 

 

 

 

2AH

Priority Mask

 

6AH

Reserved

 

AAH

Reserved

 

EAH

Reserved

 

 

 

 

 

 

 

 

 

 

 

2CH

In-Service

 

6CH

Reserved

 

ACH

Reserved

 

ECH

Reserved

 

 

 

 

 

 

 

 

 

 

 

2EH

Interrupt Request

 

6EH

Reserved

 

AEH

Reserved

 

EEH

Reserved

 

 

 

 

 

 

 

 

 

 

 

30H

Interrupt Status

 

70H

Reserved

 

B0H

Reserved

 

F0H

Power-Save

 

 

 

 

 

 

 

 

 

 

 

32H

Timer Control

 

72H

Reserved

 

B2H

Reserved

 

F2H

Power Control

 

 

 

 

 

 

 

 

 

 

 

34H

DMA0 Int. Control

 

74H

Reserved

 

B4H

Reserved

 

F4H

Reserved

 

 

 

 

 

 

 

 

 

 

 

36H

DMA1 Int. Control

 

76H

Reserved

 

B6H

Reserved

 

F6H

Step ID

 

 

 

 

 

 

 

 

 

 

 

38H

INT0 Control

 

78H

Reserved

 

B8H

Reserved

 

F8H

Reserved

 

 

 

 

 

 

 

 

 

 

 

3AH

INT1 Control

 

7AH

Reserved

 

BAH

Reserved

 

FAH

Reserved

 

 

 

 

 

 

 

 

 

 

 

3CH

INT2 Control

 

7CH

Reserved

 

BCH

Reserved

 

FCH

Reserved

 

 

 

 

 

 

 

 

 

 

 

3EH

INT3 Control

 

7EH

Reserved

 

BEH

Reserved

 

FEH

Relocation

 

 

 

 

 

 

 

 

 

 

 

Figure 3. Peripheral Control Block Registers

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Intel 80C188EA, 80L186EA, 80L188EA, 80C186EA specifications Peripheral Control Block Registers

80L186EA, 80L188EA, 80C186EA, 80C188EA specifications

The Intel 80C188EA, 80C186EA, 80L188EA, and 80L186EA microprocessors represent significant developments in the realm of embedded computing during the 1980s. These processors are part of Intel's x86 architecture, designed to cater to a variety of industrial applications, including automotive and telecommunications.

The 80C188EA and 80C186EA are CMOS variants that offer enhanced power efficiency and reduced heat generation compared to their NMOS predecessors. Operating at clock speeds of up to 25 MHz, these processors are known for their performance in real-time applications. The 80C188EA features a 16-bit data bus and a 16-bit address bus, which can support up to 1 MB of addressable memory. It also boasts an extended instruction set for greater computing flexibility, making it suitable for intricate tasks in embedded systems.

Similarly, the 80C186EA is characterized by its 16-bit architecture, but it includes additional on-chip memory management capabilities. This processor can handle 256 KB of memory directly and supports paged memory management, facilitating efficient multitasking and resource sharing in complex applications. Its integrated DMA controller and interrupt controller allow for superior handling of peripheral devices, making it ideal for real-time processing requirements.

On the other hand, the 80L188EA and 80L186EA are low-power variants optimized for battery-operated designs. These microprocessors are tailored for applications where power consumption is critical. The 80L188EA retains the essential features of the 80C188EA but operates at lower voltage levels, thus allowing for longer operational life in portable devices. The 80L186EA similarly benefits from reduced power consumption, taking advantage of its energy-efficient design to enhance durability in industrial automation scenarios.

All four processors leverage Intel's established x86 architecture, enabling a wide range of software compatibility. Their built-in support for real-time interrupt handling and I/O operations provides developers with valuable tools for building reliable embedded systems. Additionally, they feature on-chip oscillators and timers, further streamlining design requirements and reducing the need for external components.

Overall, the Intel 80C188EA, 80C186EA, 80L188EA, and 80L186EA processors are ideal for diverse applications in embedded systems. Their blend of processing power, energy efficiency, and versatility continues to influence the design of modern electronic devices, underscoring Intel's pivotal role in advancing microprocessor technology.