参数资料
型号: ATTINY24A-CCU
厂商: Atmel
文件页数: 64/135页
文件大小: 0K
描述: MCU AVR 2KB FLASH 20MHZ 15-UFBGA
产品培训模块: MCU Product Line Introduction
tinyAVR Introduction
标准包装: 490
系列: AVR® ATtiny
核心处理器: AVR
芯体尺寸: 8-位
速度: 20MHz
连通性: USI
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 12
程序存储器容量: 2KB(1K x 16)
程序存储器类型: 闪存
EEPROM 大小: 128 x 8
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 1.8 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: 15-UFBGA
包装: 托盘
33
8183F–AVR–06/12
ATtiny24A/44A/84A
7.
Power Management and Sleep Modes
The high performance and industry leading code efficiency makes the AVR microcontrollers an
ideal choise for low power applications. In addition, 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 consumption to the application’s requirements.
7.1
Sleep Modes
Figure 6-1 on page 24 presents the different clock systems and their distribution in
ATtiny24A/44A/84A. The figure is helpful in selecting an appropriate sleep mode. Table 7-1
shows the different sleep modes and their wake up sources.
Note:
1. For INT0, only level interrupt.
To enter any of the three sleep modes, the SE bit in MCUCR must be written to logic one and a
SLEEP instruction must be executed. The SM[1:0] bits in the MCUCR Register select which
sleep mode (Idle, ADC Noise Reduction, Standby or Power-down) will be activated by the
SLEEP instruction. See Table 7-2 on page 37 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.
Note that if a level triggered interrupt is used for wake-up the changed level must be held for
some time to wake up the MCU (and for the MCU to enter the interrupt service routine). See
7.1.1
Idle Mode
When the SM[1:0] bits are written to 00, the SLEEP instruction makes the MCU enter Idle mode,
stopping the CPU but allowing Analog Comparator, ADC, Timer/Counter, Watchdog, and the
interrupt system to continue operating. This sleep mode basically halts clk
CPU and clkFLASH, while
allowing the other clocks to run.
Idle mode enables the MCU to wake up from external triggered interrupts as well as internal
ones like the Timer Overflow. If wake-up from the Analog Comparator interrupt is not required,
Table 7-1.
Active Clock Domains and Wake-up Sources in Different Sleep Modes
Sleep Mode
Active Clock Domains
Oscillators
Wake-up Sources
clk
CP
U
clk
FLASH
clk
IO
clk
AD
C
Main
Clo
ck
Source
Enab
led
IN
T0
an
d
Pin
Cha
nge
SPM
/EEPROM
Read
y
Interrupt
ADC
In
te
rru
p
t
Other
I/O
W
a
tch
dog
In
te
rru
p
t
Idle
X
XX
ADC Noise Reduction
X
XX
X
Power-down
X
Stand-by
X
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