参数资料
型号: ST72511R6T6/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 93/164页
文件大小: 1043K
代理商: ST72511R6T6/XXX
ST72311R, ST72511R, ST72512R, ST72532R
34/164
7 POWER SAVING MODES
7.1 INTRODUCTION
To give a large measure of flexibility to the applica-
tion in terms of power consumption, four main
power saving modes are implemented in the ST7
(see Figure 18): SLOW, WAIT (SLOW WAIT), AC-
TIVE HALT and HALT.
After a RESET the normal operating mode is se-
lected 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 2 (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 the oscil-
lator status.
Figure 18. Power Saving Mode Transitions
7.2 SLOW MODE
This mode has two targets:
– To reduce power consumption by decreasing the
internal clock in the device,
– To adapt the internal clock frequency (fCPU)to
the available supply voltage.
SLOW mode is controlled by three bits in the
MISCR1 register: the SMS bit which enables or
disables Slow mode and two CPx bits which select
the internal slow frequency (fCPU).
In this mode, the oscillator frequency can be divid-
ed by 4, 8, 16 or 32 instead of 2 in normal operat-
ing mode. The CPU and peripherals are clocked at
this lower frequency.
Note: SLOW-WAIT mode is activated when enter-
ring the WAIT mode while the device is already in
SLOW mode.
Figure 19. SLOW Mode Clock Transitions
POWER CONSUMPTION
WAIT
SLOW
RUN
ACTIVE HALT
High
Low
SLOW WAIT
HALT
00
01
SMS
CP1:0
fCPU
NEW SLOW
NORMAL RUN MODE
MISCR1
FREQU ENCY
REQUEST
fOSC/2
fOSC/4
fOSC/8
fOSC/2
相关PDF资料
PDF描述
ST72532R4T7S/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72512R4T1S/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72532R4T1S/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72T512R4T6 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72T512R4T7 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP64
相关代理商/技术参数
参数描述
ST72561K4 制造商:STMicroelectronics 功能描述:LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS,FLASH MEMORY, - Bulk
ST72589-EMU2 功能描述:仿真器/模拟器 ST7 Emulator Board RoHS:否 制造商:Blackhawk 产品:System Trace Emulators 工具用于评估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2
ST72611F1 制造商:STMicroelectronics 功能描述:LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS,FLASH MEMORY, - Bulk
ST7263-EMU2 功能描述:仿真器/模拟器 ST7 Emulator Board RoHS:否 制造商:Blackhawk 产品:System Trace Emulators 工具用于评估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2
ST7265X-EVAL/MS 制造商:STMicroelectronics 功能描述:ST6 EVAL BD - Bulk