80C186-16 Advanced Micro Devices, 80C186-16 Datasheet

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80C186-16

Manufacturer Part Number
80C186-16
Description
AMD -
Manufacturer
Advanced Micro Devices
Datasheet
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 (specifica-
tions 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
n Industrial operating information at 20 MHz. This is the same information that was published in the discontinued
CLOCKING INFORMATION CHANGES
Crystal-Driven Clock Source
The internal oscillator circuit of the microcontroller is
designed to func ti on with a par allel res onant
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.
Selecting a Crystal
When selecting a crystal, you should always specify the
load capacitance (C
the oscillation frequency from the desired specified value
(resonance). The load capacitance and the loading of the
feedback network have the following relationship:
where C
the crystal and C
This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this product
without notice.
are not followed, you may experience problems with clock start-up.
80C186/80C188 CMOS High-Integration 16-Bit Microprocessors Amendment .
S
AMENDMENT
is the stray capacitance of the circuit. Placing
C
L
= (( C
L
L
). This value can cause variance in
1
in series across the inverting
• C
2
)/( C
1
+ C
2
)) + C
S
amplifier and tuning these values (C
crystal to oscillate at resonance. This relationship is
true for both fundamental and third-overtone operation.
Finally, there is a relationship between C
enhance the oscillation of the inverting amplifier, these
values must be offset with the larger load on the output
(X2). Equal values of these loads tend to balance the
poles of the inverting amplifier.
The characteristics of the inverting amplifier set limits
on the following parameters for crystals:
ESR (Equivalent Series Resistance) ........... 40
Drive Level .................................................. 1 mW Max
The recommended range of values for C1and C2 are
as follows:
C
C
You must determine the specific values for C
The values are dependent on the characteristics of the
chosen crystal and board design. The C
values include the stray capacitances of the design.
Figure 1 on page 2 shows the correct connection of the
oscillator configurations. Figure 1a shows the inverting
amplifier configuration. This is the equivalent circuitry
with the inverter integrated into the microcontroller.
Figure 1b shows the crystal configuration. The diagram
shows the correct connection for third-overtone
crystals. The fundamental mode crystals do not require
the L
recommended crystal mode based on the crystal
frequency. The 80C186 and 80C188 microprocessors
use a crystal twice the CPU frequency and can use
either fundamental or third-overtone mode crystals,
depending on the CPU frequency.
1
2
.............................................................15 pF ± 20%
.............................................................22 pF ± 20%
1
or the 200-pF capacitor. Figure 1c shows the
Publication# 16514
Issue Date: October 1998
Rev: D Amendment/1
1
, C
2
1
) allows the
and C
1
1
and C
and C
2
Max
. To
2
2
.

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80C186-16 Summary of contents

Page 1

... CMOS High-Integration 16-Bit Microprocessors Amendment (specifica- tions 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. ...

Page 2

... Crystal Inverting Amplifier Configuration Fundamental 20 MHz Figure 1. Oscillator Configurations and Recommended Crystal Modes 2 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment Crystal 200 pF b. Crystal Configuration Notes: 1. Use for third overtone mode crystals. Fundamental mode crystals do not use L1 or the 200-pF capacitor ...

Page 3

... Queue Status Waveforms” on page 15 n “RESET and HOLD/HLDA Timings” on page 16 n “RESET Waveforms” on page 16 n “HOLD/HLDA Waveforms (Entering HOLD)” on page 17 n “HOLD/HLDA Waveforms (Leaving HOLD)” on page 17 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 4

... All timings are measured at 1.5 V and 100-pF loading on CLKOUT unless otherwise noted. All output test conditions are with C = 50–100 pF (10–20 MHz). For AC tests, input Equal loading. 3. DEN, INTA, WR. 4 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 5

... If latched, A1 and A2 are selected instead of PCS5 and PCS6; only t 3. For write cycle followed by read cycle next bus cycle Changes in t-state preceding next bus cycle if followed by write. 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 6

... All timings are measured at 1.5 V and 100-pF loading on CLKOUT unless otherwise noted. All output test conditions are with C = 50–100 pF (10–20 MHz). For AC tests, input Equal loading. 3. DEN, INTA, WR. 6 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 7

... If latched, A1 and A2 are selected instead of PCS5 and PCS6; only t 3. For write cycle followed by read cycle next bus cycle Changes in t-state preceding next bus cycle if followed by read, INTA, or halt. 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 8

... MHz) and C = 50–100 pF (12.5–20 MHz). For AC tests, input where – 0 Equal loading. 3. DEN, INTA, WR. 8 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment Preliminary 20 MHz Min ...

Page 9

... For write cycle followed by interrupt acknowledge cycle. 5. LOCK is active upon t of the first interrupt acknowledge cycle and inactive upon Changes in t-state preceding next bus cycle if followed by write. 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 10

... MHz) and C = 50–100 pF (12.5–20 MHz). For AC tests, input where – 0 Equal loading. 3. DEN, INTA, WR. 10 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment Preliminary 20 MHz Min Max Unit 3 29 ...

Page 11

... CLKOUT 3 S2–S0 5 A19/S6–A16/S3, AD15–AD8/A15–A8, AD7–AD0 ALE 9 DEN DT/R 22 Notes: 1. For write cycle followed by halt cycle. 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment Status Invalid Address (Note ...

Page 12

... Low and High times) should not have a duration less than 40 CLCK CHCK 3. Tested under worst case conditions Not tested. 5. Tested under worst case conditions 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment 0.45 V and V = 2.4 V, except at X1 where ...

Page 13

... Clock Waveforms X1 39 CLKOUT 41 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 14

... MHz). For AC tests, input guarantee proper operation guarantee recognition at clock edge. Synchronous Read (SRDY) Waveforms CLKOUT SRDY 14 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment 0.45 V and V = 2.4 V, except at X1 where V IL ...

Page 15

... ARDY Normally Ready System) Peripheral and Queue Status Waveforms CLKOUT 53 INT3–INT0, NMI, TEST, TMR IN DRQ0, DRQ1 TMR OUT QS0, QS1 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 16

... MHz). For AC tests, input guarantee recognition at next clock. RESET Waveforms X1 57 RES CLKOUT RESET 16 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment 0.45 V and V = 2.4 V, except at X1 where Preliminary ...

Page 17

... DT/R, S2–S0, LOCK HOLD/HLDA Waveforms (Leaving HOLD) CLKOUT 58 HOLD HLDA AD15–AD8/A15–A8, AD7–AD0, DEN A19/S6–A16/S3, RD, WR, , DT/R, BHE/RFSH S2–S0, LOCK 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

Page 18

... AMD, the AMD logo, and combinations thereof are trademarks of Advanced Micro Devices, Inc. Am186, Am188, and E86 are trademarks of Advanced Micro Devices, Inc. Product names used in this publication are for identification purposes only and may be trademarks of their respective companies. 18 80C186 and 80C188 Integrated 16-Bit Microprocessors Data Book Amendment ...

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