收藏本站
参数资料
型号： ST72F324K2
英文描述： 8-BIT MCU WITH NESTED INTERRUPTS. FLASH. 10-BIT ADC. 4 TIMERS. SPI. SCI INTERFACE
中文描述： 8位微控制器嵌套中断。闪光。 10位ADC。 4定时器。的SPI。 SCI接口
文件页数： 99/161页
文件大小： 2070K
代理商： ST72F324K2
ST72324
42/161
POWER SAVING MODES (Cont’d)
8.4 ACTIVE-HALT AND HALT MODES
ACTIVE-HALT and HALT modes are the two low-
est power consumption modes of the MCU. They
are both entered by executing the ‘HALT’ instruc-
tion. The decision to enter either in ACTIVE-HALT
or HALT mode is given by the MCC/RTC interrupt
enable flag (OIE bit in MCCSR register).
8.4.1 ACTIVE-HALT MODE
ACTIVE-HALT mode is the lowest power con-
sumption mode of the MCU with a real time clock
available. It is entered by executing the ‘HALT’ in-
struction when the OIE bit of the Main Clock Con-
troller Status register (MCCSR) is set (see Section
10.2 on page 56 for more details on the MCCSR
register).
The MCU can exit ACTIVE-HALT mode on recep-
tion of an MCC/RTC interrupt or a RESET. When
exiting ACTIVE-HALT mode by means of an MCC/
RTC interrupt, no 256 or 4096 CPU cycle delay oc-
curs. The CPU resumes operation by servicing the
interrupt or by fetching the reset vector which
woke it up (see Figure 27).
When entering ACTIVE-HALT mode, the I[1:0] bits
in the CC register are forced to ‘10b’ to enable in-
terrupts. Therefore, if an interrupt is pending, the
MCU wakes up immediately.
In ACTIVE-HALT mode, only the main oscillator
and its associated counter (MCC/RTC) are run-
ning to keep a wake-up time base. All other periph-
erals are not clocked except those which get their
clock supply from another clock generator (such
as external or auxiliary oscillator).
The safeguard against staying locked in ACTIVE-
HALT mode is provided by the oscillator interrupt.
Note: As soon as the interrupt capability of one of
the oscillators is selected (MCCSR.OIE bit set),
entering ACTIVE-HALT mode while the Watchdog
is active does not generate a RESET.
This means that the device cannot spend more
than a defined delay in this power saving mode.
CAUTION: When exiting ACTIVE-HALT mode fol-
lowing an MCC/RTC interrupt, OIE bit of MCCSR
register must not be cleared before tDELAY after
the interrupt occurs (tDELAY = 256 or 4096 tCPU de-
lay depending on option byte). Otherwise, the ST7
enters HALT mode for the remaining tDELAY peri-
od.
Figure 26. ACTIVE-HALT Timing Overview
Figure 27. ACTIVE-HALT Mode Flow-chart
Notes:
1. This delay occurs only if the MCU exits ACTIVE-
HALT mode by means of a RESET.
2. Peripheral clocked with an external clock source
can still be active.
3. Only the MCC/RTC interrupt can exit the MCU
from ACTIVE-HALT mode.
4. Before servicing an interrupt, the CC register is
pushed on the stack. The I[1:0] bits of the CC reg-
ister are set to the current software priority level of
the interrupt routine and restored when the CC
register is popped.
MCCSR
OIE bit
Power Saving Mode entered when HALT
instruction is executed
0
HALT mode
1
ACTIVE-HALT mode
HALT
RUN
256 OR 4096 CPU
CYCLE DELAY 1)
RESET
OR
INTERRUPT
HALT
INSTRUCTION
FETCH
VECTOR
ACTIVE
[MCCSR.OIE=1]
HALT INSTRUCTION
RESET
INTERRUPT 3)
Y
N
Y
CPU
OSCILLATOR
PERIPHERALS 2)
I[1:0] BITS
ON
OFF
10
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
OFF
XX 4)
ON
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
XX 4)
ON
256OR 4096CPU CLOCK
CYCLE DELAY
(MCCSR.OIE=1)
相关PDF资料
PDF描述
ST72F324K4 64Mb EDO/FPM - OBSOLETE
ST72F324K6 64Mb EDO/FPM - OBSOLETE
ST72F611F1 64Mb EDO/FPM - OBSOLETE
ST72F611F1B1 64Mb EDO/FPM - OBSOLETE
ST72P621L4B1 LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS. FLASH OR ROM MEMORY. LVD. WDG. 10-BIT ADC. 2 TIMERS. SCI. SPI
相关代理商/技术参数
参数描述
ST72F324K2B6 功能描述:8位微控制器 -MCU 5V RANGE 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
ST72F324K2T3 制造商:STMicroelectronics 功能描述:
ST72F324K2T3TR 制造商:STMicroelectronics 功能描述:
ST72F324K2T6 功能描述:8位微控制器 -MCU Flash 8K SPI/SCI 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
ST72F324K2T6TR 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
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*