Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

M80C186XL20 Datasheet(PDF) 5 Page - Intel Corporation

Part No. M80C186XL20
Description  16-BIT HIGH-INTEGRATION EMBEDDED PROCESSOR
Download  44 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  INTEL [Intel Corporation]
Homepage  http://www.intel.com
Logo 

M80C186XL20 Datasheet(HTML) 5 Page - Intel Corporation

 
Zoom Inzoom in Zoom Outzoom out
 5 / 44 page
background image
M80C186XL
Table 1 M80C186XL Pin Description
Symbol
PGA
Type
Name and Function
Pin No
VCC
9
I
System Power a5 volt power supply
43
I
VSS
26
I
System Ground
60
I
RESET
57
O
RESET Output indicates that the M80C186XL CPU is being reset and
can be used as a system reset It is active HIGH synchronized with
the processor clock and lasts an integer number of clock periods
corresponding to the length of the RES signal Reset goes inactive 2
clockout periods after RES goes inactive When tied to the TEST
BUSY pin RESET forces the M80C186XL into enhanced mode
RESET is not floated during bus hold
X1
59
I
Crystal Inputs X1 and X2 provide external connections for a
fundamental mode or third overtone parallel resonant crystal for the
X2
58
O
internal oscillator X1 can connect to an external clock instead of a
crystal In this case minimize the capacitance on X2 The input or
oscillator frequency is internally divided by two to generate the clock
signal (CLKOUT)
CLKOUT
56
O
Clock Output provides the system with a 50% duty cycle waveform
All device pin timings are specified relative to CLKOUT CLKOUT is
active during reset and bus hold
RES
24
I
An active RES causes the M80C186XL to immediately terminate its
present activity clear the internal logic and enter a dormant state
This signal may be asynchronous to the M80C186XL clock The
M80C186XL begins fetching instructions approximately 6
clock
cycles after RES is returned HIGH For proper initialization VCC must
be within specifications and the clock signal must be stable for more
than 4 clocks with RES held LOW RES is internally synchronized
This input is provided with a Schmitt-trigger to facilitate power-on RES
generation via an RC network
TEST BUSY
47
IO
The TEST pin is sampled during and after reset to determine whether
the M80C186XL is to enter Compatible or Enhanced Mode Enhanced
Mode requires TEST to be HIGH on the rising edge of RES and LOW
four CLKOUT cycles later Any other combination will place the
M80C186XL in Compatible Mode During power-up active RES is
required to configure TEST BUSY as an input A weak internal pullup
ensures a HIGH state when the input is not externally driven
TEST
In Compatible Mode this pin is configured to operate as TEST
This pin is examined by the WAIT instruction If the TEST input is
HIGH when WAIT execution begins instruction execution will
suspend TEST will be resampled every five clocks until it goes LOW
at which time execution will resume If interrupts are enabled while the
M80C186XL is waiting for TEST interrupts will be serviced
BUSYIn Enhanced Mode this pin is configured to operate as
BUSY The BUSY input is used to notify the M80C186XL of Math
Coprocessor activity Floating point instructions executing in the
M80C186XL sample the BUSY pin to determine when the Math
Coprocessor is ready to accept a new command BUSY is active
HIGH
5


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn