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80C188

AMD
Part Number 80C188
Manufacturer AMD
Description 16-Bit Microprocessors
Published Oct 24, 2015
Detailed Description AMENDMENT 80C186 and 80C188 Integrated 16-Bit Microprocessors This document amends the 80C186 and 80C188 Integrated 16-...
Datasheet PDF File 80C188 PDF File

80C188
80C188

Overview
AMENDMENT 80C186 and 80C188 Integrated 16-Bit Microprocessors This document amends the 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book, order #16514D, and replaces the discontinued 80C186/80C188 CMOS High-Integration 16-Bit Microprocessors Amendment (specifications for the 20-MHz industrial operating range).
This amendment consists of two parts: n Clock generation information changes for the 80C186 and 80C188 microcontrollers.
If the guidelines in this bulletin are not followed, you may experience problems with clock start-up.
n Industrial operating information at 20 MHz.
This is the same information that was published in the discontinued 80C186/80C188 CMOS High-Integration 16-Bit Microprocessors Amendment.
CLOCKING INFORMATION CHANGES Crystal-Driven Clock Source The internal oscillator circuit of the microcontroller is designed to function with a parallel resonant fundamental or third-overtone crystal.
The 80C186 and 80C188 microprocessors use a crystal frequency that is twice the processor frequency.
AMD does not recommend that you replace a crystal with an LC or RC equivalent for any member of the Am186™ family.
The X1 and X2 signals are connected to an internal inverting amplifier (oscillator) that provides, along with the external feedback loading, the necessary phase shift (Figure 1 on page 2).
In such a positive feedback circuit, the inverting amplifier has an output signal (X2) 180 degrees out of phase of the input signal (X1).
The external feedback network provides an additional 180 degree phase shift.
In an ideal system, the input to X1 has 360 or zero degrees of phase shift.
The external feedback network is designed to be as close as possible to ideal.
If the feedback network is not providing necessary phase shift, negative feedback dampens the output of the amplifier and negatively affects the operation of the clock generator.
Values for the loading on X1 and X2 must be chosen to provide the necessary phase shift and crystal operation.
Se...


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