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80C188XL12 Datasheet(PDF) 4 Page - Intel Corporation |
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80C188XL12 Datasheet(HTML) 4 Page - Intel Corporation |
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4 / 48 page  80C186XL80C188XL (2a) 272431 – 3 272431 – 4 (2b) Note 1 XTAL Frequency L1 Value 20 MHz 120 mH g20% 25 MHz 82 mH g20% 32 MHz 47 mH g20% 40 MHz 30 mH g20% LC network is only required when using a third overtone crystal Figure 2 Oscillator Configurations (see text) INTRODUCTION Unless specifically noted all references to the 80C186XL apply to the 80C188XL References to pins that differ between the 80C186XL and the 80C188XL are given in parentheses The following Functional Description describes the base architecture of the 80C186XL The 80C186XL is a very high integration 16-bit microprocessor It combines 15 – 20 of the most common microproces- sor system components onto one chip The 80C186XL is object code compatible with the 80868088 microprocessors and adds 10 new in- struction types to the 80868088 instruction set The 80C186XL has two major modes of operation Compatible and Enhanced In Compatible Mode the 80C186XL 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 (80C186XL only) 80C186XL CORE ARCHITECTURE 80C186XL Clock Generator The 80C186XL provides an on-chip clock generator for both internal and external clock generation The clock generator features a crystal oscillator a divide- by-two counter synchronous and asynchronous ready inputs and reset circuitry The 80C186XL oscillator circuit is designed to be used either with a parallel resonant fundamental or third-overtone mode crystal depending upon the frequency range of the application This is used as the time base for the 80C186XL The output of the oscillator is not directly available outside the 80C186XL The recommended crystal configuration is shown in Figure 2b 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 2a 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 Intel recommends the following values for crystal se- lection parameters Temperature Range Application Specific ESR (Equivalent Series Resistance) 60X max C0 (Shunt Capacitance of Crystal) 70 pF max C1 (Load Capacitance) 20 pF g2pF Drive Level 2 mW max 4 4 |
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