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ATMEGA48PA-CCU 参数 Datasheet PDF下载

ATMEGA48PA-CCU图片预览
型号: ATMEGA48PA-CCU
PDF下载: 下载PDF文件 查看货源
内容描述: [RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 20MHz, CMOS, PBGA32, 4 X 4 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, GREEN, PLASTIC, UFBGA-32]
分类和应用: 闪存微控制器
文件页数/大小: 349 页 / 2752 K
品牌: ATMEL [ ATMEL ]
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• Bit 6 - PRTIM2: Power Reduction Timer/Counter2  
Writing a logic one to this bit shuts down the Timer/Counter2 module in synchronous  
mode (AS2 is 0). When the Timer/Counter2 is enabled, operation will continue like  
before the shutdown.  
• Bit 5 - PRTIM0: Power Reduction Timer/Counter0  
Writing a logic one to this bit shuts down the Timer/Counter0 module. When the  
Timer/Counter0 is enabled, operation will continue like before the shutdown.  
• Bit 4 - Res: Reserved bit  
This bit is reserved in ATmega48/88/168 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 - PRUSART0: Power Reduction USART0  
Writing a logic one to this bit shuts down the USART by stopping the clock to the mod-  
ule. When waking up the USART again, the USART should be re initialized to ensure  
proper operation.  
• Bit 0 - PRADC: Power Reduction ADC  
Writing a logic one to this bit shuts down the ADC. The ADC must be disabled before  
shut down. The analog comparator cannot use the ADC input MUX when the ADC is  
shut down.  
Minimizing Power  
Consumption  
There are several possibilities to consider when trying to minimize the power consump-  
tion 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 particu-  
lar, the following modules may need special consideration when trying to achieve the  
lowest possible power consumption.  
Analog to Digital Converter  
Analog Comparator  
If enabled, the ADC will be enabled in all sleep modes. To save power, the ADC should  
be disabled before entering any sleep mode. When the ADC is turned off and on again,  
the next conversion will be an extended conversion. Refer to “Analog-to-Digital Con-  
verter” on page 231 for details on ADC operation.  
When entering Idle mode, the Analog Comparator should be disabled if not used. When  
entering ADC Noise Reduction mode, the Analog Comparator should be disabled. 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 disabled in all sleep modes. Otherwise, the Internal Voltage Ref-  
erence will be enabled, independent of sleep mode. Refer to “Analog Comparator” on  
page 228 for details on how to configure the Analog Comparator.  
Brown-out Detector  
If the Brown-out Detector is not needed by the application, this module should be turned  
off. If the Brown-out Detector is enabled by the BODLEVEL Fuses, it will be enabled in  
all sleep modes, and hence, always consume power. In the deeper sleep modes, this  
38  
ATmega48/88/168  
2545D–AVR–07/04  
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