參數(shù)資料
型號(hào)： AM188ER-25KCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： CA-BAYONET
中文描述： 16-BIT, 25 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁(yè)數(shù)： 56/112頁(yè)
文件大?。?/td> 2878K
代理商： AM188ER-25KCW
56
Am186
TM
ER and Am188
TM
ER Microcontrollers Data Sheet
DRAFT
ation is programmable by the user.
Figure 13. DMA Unit Block Diagram
ASYNCHRONOUS SERIAL PORT
The Am186ER and Am188ER microcontrollers provide
an asynchronous serial port. The asynchronous serial
port is a two-pin interface that permits full-duplex bidi-
rectional data transfer. The asynchronous serial port
supports the following features:
n
Full-duplex operation
n
7-bit or 8-bit data transfers
n
Odd, even, or no parity
n
1 or 2 stop bits
If additional RS-232 signals are required, they can be
created with available PIO pins. The asynchronous se-
rial port transmit and receive sections are double buff-
ered. Break character, framing, parity, and overrun
The transmit/receive clock is based on the internal pro-
cessor clock, which is divided down internally to the se-
rial port operating frequency. The serial port permits 7-
bit and 8-bit data transfers. DMA transfers using the se-
rial port are supported.
The serial port generates one interrupt for any of three
serial port events—transmit complete, data received,
and receive error.
The serial port can be used in power-save mode, but
the software must adjust the transfer rate to correctly
reflect the new internal operating frequency and must
ensure that the serial port does not receive any infor-
mation while the frequency is being changed.
DMA Transfers through the Serial Port
The DMA channels can be directly connected to the
asynchronous serial port. DMA and serial port transfer
is accomplished by programming the DMA controller to
perform transfers between a memory or I/O space and
a serial port transmit or receive register. For more infor-
mation see the DMA control register descriptions in the
Am186ER and Am188ER Microcontrollers User’s Man-
ual
, order #21684.
SYNCHRONOUS SERIAL INTERFACE
The synchronous serial interface (SSI) enables the
Am186ER and Am188ER microcontrollers to communi-
cate with application-specific integrated circuits (ASICs)
that require reprogrammability but are short on pins.
This four-pin interface permits half-duplex, bidirectional
data transfer at speeds of up to 25 Mbit/s.
Unlike the asynchronous serial port, the SSI operates
in a master/slave configuration. The Am186ER and
Am188ER microcontrollers are the master ports.
The SSI interface provides four pins for communicating
with system components: two enables (SDEN0 and
SDEN1), a clock (SCLK), and a data pin (SDATA). Five
20-bit Adder/Subtractor
DMA
Control
Logic
Request
Selection
Logic
Adder Control
Logic
20
20
Channel Control Register 1
Channel Control Register 0
16
DRQ1/Serial Port
DRQ0/Serial Port
Timer Request
Interrupt
Request
Transfer Counter Ch. 1
Destination Address Ch. 1
Source Address Ch. 1
Destination Address Ch. 0
Source Address Ch. 0
Transfer Counter Ch. 0
Internal Address/Data Bus
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AM188ER-25VD\\W 制造商:Advanced Micro Devices 功能描述:
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