參數(shù)資料
型號: AT90USB1287-16AUR
廠商: Atmel
文件頁數(shù): 54/106頁
文件大?。?/td> 0K
描述: IC MCU AVR 128K ISP USB TQFP64
產(chǎn)品培訓模塊: megaAVR Introduction
標準包裝: 1,000
系列: AVR® 90USB
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: EBI/EMI,I²C,SPI,UART/USART,USB,USB OTG
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 48
程序存儲器容量: 128KB(128K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 4K x 8
RAM 容量: 8K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-LQFP
包裝: 帶卷 (TR)
配用: ATSTK600-ND - DEV KIT FOR AVR/AVR32
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
51
7593L–AVR–09/12
AT90USB64/128
8.
Power management and sleep modes
Sleep modes enable the application to shut down unused modules in the MCU, thereby saving
power. The AVR provides various sleep modes allowing the user to tailor the power consump-
tion to the application’s requirements.
To enter any of the five sleep modes, the SE bit in SMCR must be written to logic one and a
SLEEP instruction must be executed. The SM2, SM1, and SM0 bits in the SMCR Register select
which sleep mode (Idle, ADC Noise Reduction, Power-down, Power-save, or Standby) will be
activated by the SLEEP instruction. See Table 8-1 for a summary. If an enabled interrupt occurs
while the MCU is in a sleep mode, the MCU wakes up. The MCU is then halted for four cycles in
addition to the start-up time, executes the interrupt routine, and resumes execution from the
instruction following SLEEP. The contents of the Register File and SRAM are unaltered when
the device wakes up from sleep. If a reset occurs during sleep mode, the MCU wakes up and
executes from the Reset Vector.
Figure 7-1 on page 40 presents the different clock systems in the Atmel AT90USB64/128, and
their distribution. The figure is helpful in selecting an appropriate sleep mode.
8.0.1
SMCR – Sleep Mode Control Register
The Sleep Mode Control Register contains control bits for power management.
Bits 3, 2, 1 – SM2..0: Sleep Mode Select Bits 2, 1, and 0
These bits select between the six available sleep modes as shown in Table 8-1.
Note:
1. Standby modes are only recommended for use with external crystals or resonators.
Bit 1 – SE: Sleep Enable
The SE bit must be written to logic one to make the MCU enter the sleep mode when the SLEEP
instruction is executed. To avoid the MCU entering the sleep mode unless it is the programmer’s
purpose, it is recommended to write the Sleep Enable (SE) bit to one just before the execution of
the SLEEP instruction and to clear it immediately after waking up.
Bit
7654
32
10
––––
SM2
SM1
SM0
SE
SMCR
Read/write
RRRR
R/W
Initial value
0000
00
Table 8-1.
Sleep mode select.
SM2
SM1
SM0
Sleep mode
000
Idle
0
1
ADC noise reduction
010
Power-down
011
Power-save
100
Reserved
101
Reserved
110
Standby (1)
1
Extended Standby (1)
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