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參數(shù)資料
| 型號： | R5F2L387CDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件頁數(shù)： | 27/74頁 |
| 文件大?。?/td> | 959K |
| 代理商： | R5F2L387CDFP |
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34
2588F–AVR–06/2013
ATtiny261/461/861
Bits 6:4 – Res: Reserved Bits
These bits are reserved and will always read as zero.
Bits 3:0 – CLKPS3:0: Clock Prescaler Select Bits 3 - 0
These bits define the division factor between the selected clock source and the internal system
clock. These bits can be written run-time to vary the clock frequency to suit the application
requirements. As the divider divides the master clock input to the MCU, the speed of all synchro-
nous peripherals is reduced when a division factor is used. The division factors are given in
To avoid unintentional changes of clock frequency, a special write procedure must be followed
to change the CLKPS bits:
1.
Write the Clock Prescaler Change Enable (CLKPCE) bit to one and all other bits in
CLKPR to zero.
2.
Within four cycles, write the desired value to CLKPS while writing a zero to CLKPCE.
Interrupts must be disabled when changing prescaler setting to make sure the write procedure is
not interrupted.
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 eight 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 selcted 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 6-13.
Clock Prescaler Select
CLKPS3
CLKPS2
CLKPS1
CLKPS0
Clock Division Factor
0
000
1
0
001
2
0
010
4
0
011
8
0
100
16
0
101
32
0
110
64
0
111
128
1
000
256
1
001
Reserved
1
010
Reserved
1
011
Reserved
1
100
Reserved
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