參數(shù)資料
型號(hào)： MD83C154TXXX-20P883
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
文件頁(yè)數(shù)： 86/91頁(yè)
文件大小： 19688K
代理商： MD83C154TXXX-20P883
44
7707F–AVR–11/10
AT90USB82/162
Bit 4 - Res: Reserved bit
This bit is reserved and will always read as zero.
Bit 3 - PRTIM1: Power Reduction Timer/Counter1
Writing a logic one to this bit shuts down the Timer/Counter1 module. When the Timer/Counter1
is enabled, operation will continue like before the shutdown.
Bit 2 - PRSPI: Power Reduction Serial Peripheral Interface
Writing a logic one to this bit shuts down the Serial Peripheral Interface by stopping the clock to
the module. When waking up the SPI again, the SPI should be re initialized to ensure proper
operation.
Bit 1 - Res: Reserved bit
These bits are reserved and will always read as zero.
Bit 0 - Res: Reserved bit
These bits are reserved and will always read as zero.
8.6.2
Power Reduction Register 1 - PRR1
Bit 7 - PRUSB: Power Reduction USB
Writing a logic one to this bit shuts down the USB by stopping the clock to the module. When
waking up the USB again, the USB should be re initialized to ensure proper operation.
Bit 6..1 - Res: Reserved bits
These bits are reserved and will always read as zero.
Bit 0 - PRUSART1: Power Reduction USART1
Writing a logic one to this bit shuts down the USART1 by stopping the clock to the module.
When waking up the USART1 again, the USART1 should be re initialized to ensure proper
operation.
8.7
Minimizing Power Consumption
There are several issues to consider when trying to minimize the power consumption in an AVR
controlled system. In general, sleep modes should be used as much as possible, and the sleep
mode should be selected so that as few as possible of the device’s functions are operating. All
functions not needed should be disabled. In particular, the following modules may need special
consideration when trying to achieve the lowest possible power consumption.
8.7.1
Analog Comparator
When entering Idle mode, the Analog Comparator should be disabled if not used. In other sleep
modes, the Analog Comparator is automatically disabled. However, if the Analog Comparator is
set up to use the Internal Voltage Reference as input, the Analog Comparator should be dis-
abled in all sleep modes. Otherwise, the Internal Voltage Reference will be enabled,
Bit
7
654
3
2
1
0
PRUSB
–
-
–
PRUSART1
PRR1
Read/Write
R/W
R
R/W
R
R/W
Initial Value
0
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