EN80C186EA20 데이터 시트보기 (PDF) - Intel

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EN80C186EA20

16-Bit High-Integration Embedded Processors

Intel 

3.0

3.1

3.2

Intel® 80C186EA Peripheral Architecture

Intel® 80C186EA Peripheral Architecture

The 80C186EA has integrated several common system peripherals with a CPU core to create a

compact, yet powerful system. The integrated peripherals are designed to be flexible and provide

logical interconnections between supporting units (e.g., the interrupt control unit supports interrupt

requests from the timer/counters or DMA channels).

The list of integrated peripherals include:

• 4-Input Interrupt Control Unit

• 3-Channel Timer/Counter Unit

• 2-Channel DMA Unit

• 13-Output Chip-Select Unit

• Refresh Control Unit

• Power Management Logic

The registers associated with each integrated peripheral are contained within a 128 x 16 register

file called the Peripheral Control Block (PCB). The PCB can be located in either memory or I/O

space on any 256 byte address boundary.

Table 1 provides a list of the registers associated with the PCB when the processor's Interrupt

Control Unit is in Master Mode. In Slave Mode, the definitions of some registers change. Table 2

provides register definitions specific to Slave Mode.

Interrupt Control Unit

The 80C186EA can receive interrupts from a number of sources, both internal and external. The

Interrupt Control Unit (ICU) serves to merge these requests on a priority basis, for individual

service by the CPU. Each interrupt source can be independently masked by the Interrupt Control

Unit or all interrupts can be globally masked by the CPU.

Internal interrupt sources include the Timers and DMA channels. External interrupt sources come

from the four input pins INT3:0. The NMI interrupt pin is not controlled by the ICU and is passed

directly to the CPU. Although the timers only have one request input to the ICU, separate vector

types are generated to service individual interrupts within the Timer Unit.

Timer/Counter Unit

The 80C186EA Timer/Counter Unit (TCU) provides three 16-bit programmable timers. Two of

these are highly flexible and are connected to external pins for control or clocking. A third timer is

not connected to any external pins and can only be clocked internally. However, it can be used to

clock the other two timer channels. The TCU can be used to count external events, time external

events, generate non-repetitive waveforms, generate timed interrupts, etc.

Product Name Datasheet

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