参数资料
型号: AT90PWM1-16SU
厂商: Atmel
文件页数: 31/90页
文件大小: 0K
描述: MCU AVR 8K FLASH 16MHZ 24-SOIC
产品培训模块: MCU Product Line Introduction
megaAVR Introduction
标准包装: 1,116
系列: AVR® 90PWM 照明
核心处理器: AVR
芯体尺寸: 8-位
速度: 16MHz
连通性: SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 19
程序存储器容量: 8KB(8K x 8)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 512 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 ~ 105°C
封装/外壳: 24-SOIC(0.295",7.50mm 宽)
包装: 管件
配用: ATSTK600-RC19-ND - STK600 ROUTING CARD AVR
ATSTK600-SOIC-ND - STK600 SOCKET/ADAPTER FOR SOIC
37
4378C–AVR–09/08
AT90PWM1
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 3 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 exe-
cutes from the Reset Vector.
Figure 7-1 on page 27 presents the different clock systems in the AT90PWM1, and their distribu-
tion. The figure is helpful in selecting an appropriate sleep mode.
8.0.1
Sleep Mode Control Register – SMCR
The Sleep Mode Control Register contains control bits for power management.
Bits 3..1 – SM2..0: Sleep Mode Select Bits 2, 1, and 0
These bits select between the five available sleep modes as shown in Table 3.
Note:
1. Standby mode is 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
7
6
5
4
3
2
1
0
SM2
SM1
SM0
SE
SMCR
Read/Write
R
R/W
Initial Value
0
Table 3. Sleep Mode Select
SM2
SM1
SM0
Sleep Mode
00
0
Idle
0
1
ADC Noise Reduction
0
1
0
Power-down
0
1
Reserved
1
0
Reserved
1
0
1
Reserved
1
0
Standby
1
Reserved
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