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ATmega1284P bảng dữ liệu(PDF) 39 Page - ATMEL Corporation

tên linh kiện ATmega1284P
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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ATmega1284P bảng dữ liệu(HTML) 39 Page - ATMEL Corporation

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8059D–AVR–11/09
ATmega1284P
The CKDIV8 Fuse determines the initial value of the CLKPS bits. If CKDIV8 is unprogrammed,
the CLKPS bits will be reset to “0000”. If CKDIV8 is programmed, CLKPS bits are reset to
“0011”, giving a division factor of 8 at start up. This feature should be used if the selected clock
source has a higher frequency than the maximum frequency of the device at the present operat-
ing conditions. Note that any value can be written to the CLKPS bits regardless of the CKDIV8
Fuse setting. The Application software must ensure that a sufficient division factor is chosen if
the selected clock source has a higher frequency than the maximum frequency of the device at
the present operating conditions. The device is shipped with the CKDIV8 Fuse programmed.
Table 7-17.
Clock Prescaler Select
CLKPS3
CLKPS2
CLKPS1
CLKPS0
Clock Division Factor
00
00
1
00
01
2
00
10
4
00
11
8
01
00
16
01
01
32
01
10
64
01
11
128
10
00
256
10
01
Reserved
10
10
Reserved
10
11
Reserved
11
00
Reserved
11
01
Reserved
11
10
Reserved
11
11
Reserved



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