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參數(shù)資料
| 型號(hào)： | ATMEGA8 |
| 廠商： | Atmel Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| 中文描述： | 位AVR微控制器具有8K字節(jié)的系統(tǒng)內(nèi)可編程閃存 |
| 文件頁(yè)數(shù)： | 100/125頁(yè) |
| 文件大?。?/td> | 6456K |
| 代理商： | ATMEGA8 |
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33
2486AA–AVR–02/2013
ATmega8(L)
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 MCUCR must be written to logic one and a
SLEEP instruction must be executed. The SM2, SM1, and SM0 bits in the MCUCR Register
select which sleep mode (Idle, ADC Noise Reduction, Power-down, Power-save, or Standby)
will be activated by the SLEEP instruction. See Table 13 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, it 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.
Note that the Extended Standby mode present in many other AVR MCUs has been removed in
the ATmega8, as the TOSC and XTAL inputs share the same physical pins.
Figure 10 on page 25 presents the different clock systems in the ATmega8, and their distribu-
tion. The figure is helpful in selecting an appropriate sleep mode.
MCU Control Register
– MCUCR
The MCU Control Register contains control bits for power management.
Bit 7 – 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 set the Sleep Enable (SE) bit just before the execution of the
SLEEP instruction.
Bits 6..4 – SM2..0: Sleep Mode Select Bits 2, 1, and 0
These bits select between the five available sleep modes as shown in Table 13.
Note:
1. Standby mode is only available with external crystals or resonators
Bit
765
4321
0
SE
SM2
SM1
SM0
ISC11
ISC10
ISC01
ISC00
MCUCR
Read/Write
R/W
Initial Value
000
0000
0
Table 13. 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)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ATMEGA8-16AC | 功能描述:8位微控制器 -MCU AVR 8K FLASH 512B EE 1K SRAM ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| ATMEGA8-16AI | 功能描述:8位微控制器 -MCU AVR 8K FLASH 512B EE 1K SRAM ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| ATMEGA8-16AI SL383 | 制造商:Atmel Corporation 功能描述:MCU 8-Bit ATmega AVR RISC 8KB Flash 5V 32-Pin TQFP T/R |
| ATMEGA8-16AJ | 功能描述:IC MCU AVR 8K 5V 16MHZ 32-TQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AVR® ATmega 標(biāo)準(zhǔn)包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR，WDT 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:32KB（32K x 8） 程序存儲(chǔ)器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件 |
| ATmega8-16AU | 功能描述:8位微控制器 -MCU 8kB Flash 0.5kB EEPROM 23 I/O Pins RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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