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AM186ESLV Folha de dados(PDF) 10 Page - Advanced Micro Devices

Nome de Peças AM186ESLV
Descrição Electrónicos  High Performance, 80C186-/80C188-Compatible and 80L186-/80L188-Compatible, 16-Bit Embedded Microcontrollers
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Fabricante Electrônico  AMD [Advanced Micro Devices]
Página de início  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM186ESLV Folha de dados(HTML) 10 Page - Advanced Micro Devices

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10
Am186/188ES and Am186/188ESLV Microcontrollers
PRELIMIN ARY
KEY FEATURES AND BENEFITS
The Am186ES and Am188ES microcontrollers extend
the AMD family of microcontrollers based on the
industry-standard x86 architecture. The Am186ES and
Am188ES microcontrollers are higher-performance,
m o r e int egr at ed ver s io ns o f th e 80C 186 /18 8
microprocessors, offering an attractive migration path.
I n add ition , th e Am 186 ES a nd Am18 8ES
microcontrollers offer application-specific features that
can enhance the system functionality of the Am186EM
and Am188EM microcontrollers. Upgrading to the
Am186ES and Am188ES microcontrollers is an
attractive solution for several reasons:
n Minimized total system cost—New peripherals
and on-chip system interface logic on the Am186ES
and Am188ES microcontrollers reduce the cost of
existing 80C186/188 designs.
n x86 software compatibility—80C186/188-com-
patible and upward-compatible with the other mem-
bers of the AMD E86 family. The x86 architecture is
the most widely used and supported computer ar-
chitecture in the world.
n Enhanced performance—The Am186ES and
Am188ES microcontrollers increase the perfor-
mance of 80C186/188 systems, and the nonmulti-
plexed address bus offers faster, unbuffered access
to memory.
n Enhanced functionality—The new and enhanced
on-chip peripherals of the Am186ES and Am188ES
microcontrollers include two asynchronous serial
ports, 32 PIOs, a watchdog timer, additional inter-
rupt pins, a pulse width demodulation option, DMA
directly to and from the serial ports, 8-bit and 16-bit
static bus sizing, a PSRAM controller, a 16-bit reset
configuration register, and enhanced chip-select
functionality.
Application Considerations
The integration enhancements of the Am186ES and
Am 188ES micr ocon tr olle r s pr ovid e a hig h -
performance, low-system-cost solution for 16-bit
e mbed ded
m icr ocont r o ller
de signs.
Th e
nonmultiplexed address bus eliminates the need for
system-support logic to interface memory devices,
while the multiplexed address/data bus maintains the
value of previously engineered, customer-specific
peripherals and circuits within the upgraded design.
Figure 1 illustrates an example system design that
uses the integrated peripheral set to achieve high
performance with reduced system cost.
Clock Generation
The integrated clock generation circuitry of the
Am186ES and Am188ES microcontrollers allows the
use of a times-one crystal frequency. The design
shown in Figure 1 achieves 40-MHz CPU operation,
while using a 40-MHz crystal.
Memory Interface
The int egra ted m em ory co ntroller lo gic o f th e
Am186ES and Am188ES microcontrollers provides a
direct address bus interface to memory devices. It is
not necessary to use an external address latch
controlled by the address latch enable (ALE) signal.
Individual byte-write-enable signals eliminate the need
for external high/low byte-write-enable circuitry. The
maximum bank size that is programmable for the
memory chip-select signals has been increased to
facilitate the use of high-density memory devices.
The improved memory timing specifications for the
Am186ES and Am188ES microcontrollers allow no-
wait-state operation with 70-ns memory access times
at a 40-MHz CPU clock speed. This reduces overall
system cost significantly by allowing the use of a more
commonly available memory speed and technology.
Figure 1 also shows an implementation of an RS-232
console or modem communications port. The RS-232-
to-CMOS voltage-level converter is required for the
electrical interface with the external device.
Figure 1.
Am186ES Microcontroller Example
System Design
Direct Memory Interface Example
Figure 1 illustrates the Am186ES microcontroller’s
direct memory interface. The processor A19–A0 bus
connects to the memory address inputs, the AD bus
X2
X1
RS-232
Level
Converter
Serial Port 0
LCS
UCS
WHB
WLB
WE
Address
Data
OE
CS
WE
RD
WE
Address
Data
OE
CS
WE
AD15–AD0
A19–A0
Flash PROM
Static RAM
Am186ES
Microcontroller
40-MHz
Crystal
Serial Port 1
PW
PWD Input


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