M80C186XL12 Просмотр технического описания (PDF) - Intel

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M80C186XL12

16-BIT HIGH-INTEGRATION EMBEDDED PROCESSOR

Intel 

M80C186XL

271276 – 4

(3a)

271276 – 5

(3b)

Note 1

XTAL Frequency

L1 Value

20 MHz

12 0 mH g20%

25 MHz

8 2 mH g20%

32 MHz

4 7 mH g20%

40 MHz

3 0 mH g20%

LC network is only required when using a third

overtone crystal

Figure 3 M80C186XL Oscillator Configurations (see text)

INTRODUCTION

The following Functional Description describes the

base architecture of the M80C186XL The

M80C186XL is a very high integration 16-bit micro-

processor It combines 15–20 of the most common

microprocessor system components onto one chip

The M80C186XL is object code compatible with the

8086 8088 microprocessors and adds 10 new in-

struction types to the 8086 8088 instruction set

The M80C186XL has two major modes of operation

Compatible and Enhanced In Compatible Mode the

M80C186XL is completely compatible with NMOS

80186 with the exception of 8087 support The En-

hanced mode adds three new features to the system

design These are Power-Save control Dynamic

RAM refresh and an asynchronous Numerics Co-

processor interface

third-overtone mode crystal depending upon the

frequency range of the application This is used as

the time base for the M80C186XL

The output of the oscillator is not directly available

outside the M80C186XL The recommended crystal

configuration is shown in Figure 3b When used in

third-overtone mode the tank circuit is recommend-

ed for stable operation Alternately the oscillator

may be driven from an external source as shown in

Figure 3a

The crystal or clock frequency chosen must be twice

the required processor operating frequency due to

the internal divide by two counter This counter is

used to drive all internal phase clocks and the exter-

nal CLKOUT signal CLKOUT is a 50% duty cycle

processor clock and can be used to drive other sys-

tem components All AC Timings are referenced to

CLKOUT

M80C186XL BASE ARCHITECTURE

Intel recommends the following values for crystal se-

lection parameters

M80C186XL Clock Generator

The M80C186XL provides an on-chip clock genera-

tor for both internal and external clock generation

The clock generator features a crystal oscillator a

divide-by-two counter synchronous and asynchro-

nous ready inputs and reset circuitry

Temperature Range

Application Specific

ESR (Equivalent Series Resistance)

60X max

C0 (Shunt Capacitance of Crystal)

C1 (Load Capacitance)

Drive Level

7 0 pF max

20 pF g5 pF

2 mW max

The M80C186XL oscillator circuit is designed to be

used either with a parallel resonant fundamental or

10

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