参数资料
型号: AT90USB1287-16AUR
厂商: Atmel
文件页数: 58/106页
文件大小: 0K
描述: IC MCU AVR 128K ISP USB TQFP64
产品培训模块: megaAVR Introduction
标准包装: 1,000
系列: AVR® 90USB
核心处理器: AVR
芯体尺寸: 8-位
速度: 16MHz
连通性: EBI/EMI,I²C,SPI,UART/USART,USB,USB OTG
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 48
程序存储器容量: 128KB(128K x 8)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-LQFP
包装: 带卷 (TR)
配用: ATSTK600-ND - DEV KIT FOR AVR/AVR32
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
55
7593L–AVR–09/12
AT90USB64/128
8.7.2
PRR1 – Power Reduction Register 1
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..4 - Res: Reserved bits
These bits are reserved and will always read as zero.
Bit 3 - PRTIM3: Power Reduction Timer/Counter3
Writing a logic one to this bit shuts down the Timer/Counter3 module. When the Timer/Counter3
is enabled, operation will continue like before the shutdown.
Bit 2..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.
8.8
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.
8.8.1
Analog to digital converter
If enabled, the ADC will be enabled in all sleep modes. To save power, the ADC should be dis-
abled before entering any sleep mode. When the ADC is turned off and on again, the next
conversion will be an extended conversion. Refer to “ADC – Analog to Digital Converter” on
page 307 for details on ADC operation.
8.8.2
Analog comparator
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 Reference will be enabled, independent of sleep
mode. Refer to “Analog Comparator” on page 304 for details on how to configure the Analog
Comparator.
Bit
7
6543
2
1
0
PRUSB
–––PRTIM3
PRUSART1
PRR1
Read/write
R/W
RRRR/W
R
R/W
Initial value
0
0000
0
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