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AM186ES-25VIW bảng dữ liệu(PDF) 11 Page - Advanced Micro Devices

tên linh kiện AM186ES-25VIW
Giải thích chi tiết về linh kiện  High Performance, 80C186-/80C188-Compatible and 80L186-/80L188-Compatible, 16-Bit Embedded Microcontrollers
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
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AM186ES-25VIW bảng dữ liệu(HTML) 11 Page - Advanced Micro Devices

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Am186/188ES and Am186/188ESLV Microcontrollers
11
P R E L IMINAR Y
connects to the data inputs and outputs, and the chip
selects connect to the memory chip-select inputs.
The RD output connects to the SRAM Output Enable
(OE) pin for read operations. Write operations use the
byte-write enables connected to the SRAM Write
Enable (WE) pins.
The example design uses 2-Mbit memory technology
(256 Kbytes) to fully populate the available address
space. Two flash PROM devices provide 512 Kbytes of
nonvolatile program storage, and two static RAM
devices provide 512 Kbytes of data storage area.
COMPARING THE ES TO THE 80C186
Figure 1 shows an example system using a 40-MHz
Am 18 6ES micr oco n t r olle r . F i g u r e 2 sh ow s a
comparable system implementation with an 80C186.
Because of its superior integration, the Am186ES
microcontroller system does not require the support
devices that are required on the 80C186 example
system. In addition, the Am186ES microcontroller
provides significantly better performance with its 40-
MHz clock rate.
Figure 2.
80C186 Microcontroller Example System Design
COMPARING THE ES TO THE EMTABLE1
C omp ar ed t o the Am186 EM and Am188 EM
microcontrollers, the Am186ES and Am188ES
microcontrollers have the following additional features:
n Two full-featured asynchronous serial ports
n The ability to use DMA to and from the serial ports
n Two additional external interrupt signals
n Enhancements to the watchdog timer to improve its
security and functionality
n A pulse width demodulation option
n A data strobe bus interface option for DEN
n ARDY functionality is changed to allow both edges
of ARDY to be asynchronous to the clock
n An option to have all MCS space asserted through
MCS0
n On the Am186ES microcontroller, static bus sizing
allows UCS space to use a 16-bit data bus, while
LCS space can be either 8-bit or 16-bit. All non-
UCS and non-LCS memory and I/O accesses can
be 8-bit or 16-bit. This capability is available only on
the Am186ES microcontroller; the Am188ES micro-
controller has a uniform 8-bit access width.
n The synchronous serial interface is removed
n On the ES, row addresses are not driven on DRAM
refreshes
Two Asynchronous Serial Ports
The Am186ES and Am188ES microcontrollers have
two identical asynchronous serial ports. Each serial
UCS
WR
WE
OE
CS
AD15–AD0
ALE
40-MHz
Crystal
Address
Data
Timer 0–2
INT3
DMA 0–1
CLKOUT
20 MHz
X2
X1
SRAM
WE
WE
Address
Data
OE
CS
RD
LCS
BHE
A0
PCS0
LATCH
Serial
Port
RS-232
Level
Converter
INT2–INT0
PIOs
Am29F200
Flash


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