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参数资料
| 型号： | AT89C51ID2-SLRUM |
| 厂商： | Atmel |
| 文件页数： | 128/157页 |
| 文件大小： | 0K |
| 描述： | IC 8051 MCU 64K FLASH 44-PLCC |
| 产品培训模块： | MCU Product Line Introduction |
| 标准包装： | 500 |
| 系列： | 89C |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 60MHz |
| 连通性： | I²C，SPI，UART/USART |
| 外围设备： | POR，PWM，WDT |
| 输入/输出数： | 34 |
| 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： | 44-LCC（J 形引线） |
| 包装： | 标准包装 |
| 其它名称： | AT89C51ID2-SLRUMDKR |
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72
AT89C51ID2
4289C–8051–11/05
Power Management
Introduction
Two power reduction modes are implemented in the AT89C51ID2. 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 dynami-
cally divided by 2 using the X2 mode detailed in Section “Enhanced Features”, page 21.
Idle Mode
Idle mode is a power reduction mode that reduces the power consumption. In this mode,
program 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 57.
Entering Idle Mode
To enter Idle mode, set the IDL bit in PCON register (see Table 58). The AT89C51ID2
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 AT89C51ID2 enters Power-Down mode.
Then it does not go in Idle mode when exiting Power-Down mode.
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 AT89C51ID2 and vectors the CPU to address C:0000h.
Note:
During the time that execution resumes, the internal RAM cannot be accessed; however,
it is possible 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.
Power-Down Mode
The Power-Down mode places the AT89C51ID2 in a very low power state. Power-Down
mode stops the oscillator, freezes all clock at known states. The CPU status prior to
entering Power-Down mode is preserved, i.e., the program counter, program status
word register retain their data for the duration of Power-Down mode. In addition, the SFR
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89C51ID2-SLSIM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller |
| AT89C51ID2-SLSUM | 功能描述:8位微控制器 -MCU 64K FLASH 32KHz 3.5-5V Ind. RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| AT89C51ID2-SMSIM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller |
| AT89C51ID2-UM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller |
| AT89C51RB2 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 16K/ 32K Bytes Flash |
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