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AM85C30 bảng dữ liệu(PDF) 101 Page - Advanced Micro Devices

tên linh kiện AM85C30
Giải thích chi tiết về linh kiện  Serial Communications Controller
PDF  194 Pages
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM85C30 bảng dữ liệu(HTML) 101 Page - Advanced Micro Devices

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Support Circuitry Programming
AMD
5–7
If neither the transmit clock nor the receive clock is programmed to come from the
TRxC
pin, the output of the BRG may be made available for external use on the
TRxC pin.
Figure 5–2 shows a block diagram of the BRG. The BRG input comes from the output of
a two-input multiplexer, and the zero count condition is outputed to the External/Status
Interrupt section. The BRG may be disabled and enabled by command and is disabled by
a hardware reset.
Zero Count
÷2
Baud Rate
Generator
Clock
RTxC Pin
PCLK Pin
Select
Output
WR13
WR12
16 Bit Down Counter
Figure 5–2. Baud Rate Generator
Write to
WR14
Clock
Source
Counter
Clock
Counter First Decremented
(After Hardware Reset)
Counter First Decremented
(After Previous Disable)
End of Write to WR14 with Enable
Figure 5–3. BRG Startup



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