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| 型号： | AT89C51ED2-SMSUM |
| 厂商： | Atmel |
| 文件页数： | 117/137页 |
| 文件大小： | 0K |
| 描述： | IC 8051 MCU FLASH 64K 68PLCC |
| 产品培训模块： | MCU Product Line Introduction |
| 标准包装： | 304 |
| 系列： | 89C |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 60MHz |
| 连通性： | SPI，UART/USART |
| 外围设备： | POR，PWM，WDT |
| 输入/输出数： | 50 |
| 程序存储器容量： | 64KB（64K x 8） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 2K x 8 |
| RAM 容量： | 2K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 振荡器型： | 外部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 68-PLCC |
| 包装： | 管件 |
| 配用： | AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU |
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80
4235K–8051–05/08
AT89C51RD2/ED2
18. Power Management
18.1
Introduction
Two power reduction modes are implemented in the AT89C51RD2/ED2. The Idle mode and the
Power-Down mode. These modes are detailed in the following sections. In addition to these
power reduction modes, the clocks of the core and peripherals can be dynamically divided by 2
using the X2 mode detailed in Section “Enhanced Features”, page 17.
18.2
Idle Mode
Idle mode is a power reduction mode that reduces the power consumption. In this mode, pro-
gram execution halts. Idle mode freezes the clock to the CPU at known states while the
peripherals continue to be clocked. The CPU status before entering Idle mode is preserved, i.e.,
the program counter and program status word register retain their data for the duration of Idle
mode. The contents of the SFRs and RAM are also retained. The status of the Port pins during
Idle mode is detailed in Table 18-1.
18.2.1
Entering Idle Mode
To enter Idle mode, set the IDL bit in PCON register (see Table 18-2). The AT89C51RD2/ED2
enters Idle mode upon execution of the instruction that sets IDL bit. The instruction that sets IDL
bit is the last instruction executed.
Note:
If IDL bit and PD bit are set simultaneously, the AT89C51RD2/ED2 enters Power-Down mode.
Then it does not go in Idle mode when exiting Power-Down mode.
18.2.2
Exiting Idle Mode
There are two ways to exit Idle mode:
1.
Generate an enabled interrupt.
– Hardware clears IDL bit in PCON register which restores the clock to the CPU.
Execution resumes with the interrupt service routine. Upon completion of the
interrupt service routine, program execution resumes with the instruction
immediately following the instruction that activated Idle mode. The general purpose
flags (GF1 and GF0 in PCON register) may be used to indicate whether an interrupt
occurred during normal operation or during Idle mode. When Idle mode is exited by
an interrupt, the interrupt service routine may examine GF1 and GF0.
2.
Generate a reset.
– A logic high on the RST pin clears IDL bit in PCON register directly and
asynchronously. This restores the clock to the CPU. Program execution momentarily
resumes with the instruction immediately following the instruction that activated the
Idle mode and may continue for a number of clock cycles before the internal reset
algorithm takes control. Reset initializes the AT89C51RD2/ED2 and vectors the CPU
to address C:0000h.
Note:
During the time that execution resumes, the internal RAM cannot be accessed; however, it is pos-
sible for the Port pins to be accessed. To avoid unexpected outputs at the Port pins, the instruction
immediately following the instruction that activated Idle mode should not write to a Port pin or to
the external RAM.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89C51ED2-UM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller |
| AT89C51IC2 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller with 2-wire Interface |
| AT89C51IC2_04 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller with 2-wire Interface |
| AT89C51IC2_08 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller with 2-wire Interface |
| AT89C51IC2-RLRIL | 功能描述:IC MCU FLASH 8051 32K 3V 44-VQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:89C 标准包装:1 系列:AVR® ATmega 核心处理器:AVR 芯体尺寸:8-位 速度:16MHz 连通性:I²C，SPI，UART/USART 外围设备:欠压检测/复位，POR，PWM，WDT 输入/输出数:32 程序存储器容量:32KB（16K x 16） 程序存储器类型:闪存 EEPROM 大小:1K x 8 RAM 容量:2K 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 ~ 125°C 封装/外壳:44-TQFP 包装:剪切带 (CT) 其它名称:ATMEGA324P-B15AZCT |
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