参数资料
型号: ST72F60E1M1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO24
封装: 0.300 INCH, LEAD FREE, PLASTIC, SOP-24
文件页数: 67/139页
文件大小: 1993K
代理商: ST72F60E1M1
ST7260xx
Power saving modes
33/139
9
Power saving modes
9.1
Introduction
To give a large measure of flexibility to the application in terms of power consumption, two
main power saving modes are implemented in the ST7.
After a RESET, the normal operating mode is selected by default (RUN mode). This mode
drives the device (CPU and embedded peripherals) by means of a master clock which is
based on the main oscillator frequency divided by 3 (fCPU).
From Run mode, the different power saving modes may be selected by setting the relevant
register bits or by calling the specific ST7 software instruction whose action depends on the
oscillator status.
9.2
Halt mode
The MCU consumes the least amount of power in Halt mode. The Halt mode is entered by
executing the HALT instruction. The internal oscillator is then turned off, causing all internal
processing to be stopped, including the operation of the on-chip peripherals.
When entering Halt mode, the I bit in the Condition Code Register is cleared. Thus, all
external interrupts (ITi or USB end suspend mode) are allowed and if an interrupt occurs,
the CPU clock becomes active.
The MCU can exit Halt mode on reception of either an external interrupt on ITi, an end
suspend mode interrupt coming from USB peripheral, or a reset. The oscillator is then
turned on and a stabilization time is provided before releasing CPU operation. The
stabilization time is 4096 CPU clock cycles.
After the start up delay, the CPU continues operation by servicing the interrupt which wakes
it up or by fetching the reset vector if a reset wakes it up.
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ST72F60K1U1 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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
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ST72F60K2U1TR 功能描述:8位微控制器 -MCU ST7262 Lo Spd USB 8B MCU 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