C186EA20 datasheet(8/50 Pages) INTEL

部件名	C186EA20

功能描述	16-BIT HIGH-INTEGRATION EMBEDDED PROCESSORS

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制造商	INTEL [Intel Corporation]

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80C186EA80C188EA 80L186EA80L188EA

80C187 Interface (80C186EA Only)

The 80C187 Numerics Coprocessor may be used to

extend the 80C186EA instruction set to include

floating point and advanced integer instructions

Connecting the 80C186EA RESOUT and TEST

BUSY pins to the 80C187 enables Numerics Mode

operation In Numerics Mode three of the four Mid-

Range Chip Select (MCS) pins become handshaking

pins for the interface The exchange of data and

control information proceeds through four dedicated

IO ports

If an 80C187 is not present the 80C186EA config-

ures itself for regular operation at reset

NOTE

The 80C187 is not specified for 3V operation and

therefore

does

not

interface

directly

to

the

80L186EA

ONCE Test Mode

To facilitate testing and inspection of devices when

fixed into a target system the 80C186EA has a test

mode available which forces all output and input

output pins to be placed in the high-impedance

state ONCE stands for ‘‘ON Circuit Emulation’’ The

ONCE mode is selected by forcing the UCS and LCS

pins LOW (0) during a processor reset (these pins

are weakly held to a HIGH (1) level) while RESIN is

active

DIFFERENCES BETWEEN THE

80C186XL AND THE 80C186EA

The 80C186EA is intended as a direct functional up-

grade for 80C186XL designs In many cases it will

be possible to replace an existing 80C186XL with

little or no hardware redesign The following sections

describe differences in pinout operating modes and

AC and DC specifications to keep in mind

Pinout Compatibility

The 80C186EA requires a PDTMR pin to time the

processor’s exit from Powerdown Mode The original

pin arrangement for the 80C186XL in the PLCC

package did not have any spare leads to use for

PDTMR so the DTR pin was sacrificed The ar-

rangement of all the other leads in the 68-lead PLCC

is

identical

between

the

80C186XL

and

the

80C186EA DTR may be synthesized by latching

the S1 status output Therefore upgrading a PLCC

80C186XL to PLCC 80C186EA is straightforward

The 80-lead QFP (EIAJ) pinouts are different be-

tween the 80C186XL and the 80C186EA In addition

to the PDTMR pin the 80C186EA has more power

and ground pins and the overall arrangement of pins

was shifted A new circuit board layout for the

80C186EA is required

Operating Modes

The 80C186XL has two operating modes Compati-

ble and Enhanced Compatible Mode is a pin-to-pin

replacement for the NMOS 80186 except for nu-

merics coprocessing In Enhanced Mode the proc-

essor has a Refresh Control Unit the Power-Save

feature and an interface to the 80C187 Numerics

Coprocessor The MCS0 MCS1 and MCS3 pins

change their functions to constitute handshaking

pins for the 80C187

The 80C186EA allows all non-80C187 users to use

all the MCS pins for chip-selects In regular opera-

tion all 80C186EA features (including those of the

Enhanced Mode 80C186) are present except for the

interface to the 80C187 Numerics Mode disables

the three chip-select pins and reconfigures them for

connection to the 80C187

TTL vs CMOS Inputs

The inputs of the 80C186EA are rated for CMOS

switching levels for improved noise immunity but the

80C186XL inputs are rated for TTL switching levels

In particular the 80C186EA requires a minimum VIH

of 35V to recognize a logic one while the 80C186XL

requires a minimum VIH of only 19V (assuming 50V

operation) The solution is to drive the 80C186EA

with true CMOS devices such as those from the HC

and AC logic families or to use pullup resistors

where the added current draw is not a problem

Timing Specifications

80C186EA timing relationships are expressed in a

simplified format over the 80C186XL The AC per-

formance of an 80C186EA at a specified frequency

will be very close to that of an 80C186XL at the

same frequency Check the timings applicable to

your design prior to replacing the 80C186XL

8

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类似说明 - C186EA20

制造商	部件名	数据表	功能描述
Intel Corporation	80C186XL	561Kb / 48P	16-BIT HIGH-INTEGRATION EMBEDDED PROCESSORS
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	A80C186XL20	405Kb / 48P	16-BIT HIGH-INTEGRATION EMBEDDED PROCESSORS
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	EE80C186XL20	405Kb / 48P	16-BIT HIGH-INTEGRATION EMBEDDED PROCESSORS
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