参数资料
型号: MB9AF311NBGL
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PBGA112
封装: 0.80 MM PITCH, PLASTIC, FBGA-112
文件页数: 43/114页
文件大小: 1357K
代理商: MB9AF311NBGL
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
34
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
operating 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 9-17. Clock Prescaler Select
CLKPS3
CLKPS2
CLKPS1
CLKPS0
Clock Division Factor
0
1
0
1
2
0
1
0
4
0
1
8
0
1
0
16
0
1
0
1
32
0
1
0
64
0
1
128
1
0
256
1
0
1
Reserved
1
0
1
0
Reserved
1
0
1
Reserved
1
0
Reserved
1
0
1
Reserved
1
0
Reserved
1
Reserved
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