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参数资料
型号： ST72C215G2M7
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, PDSO28
封装： 0.300 INCH, PLASTIC, SOIC-28
文件页数： 63/140页
文件大小： 2246K
代理商： ST72C215G2M7
ST72104G, ST72215G, ST72216G, ST72254G
29/140
POWER SAVING MODES (Cont’d)
8.4 HALT MODE
The HALT mode is the lowest power consumption
mode of the MCU. It is entered by executing the
ST7 HALT instruction (see Figure 20).
The MCU can exit HALT mode on reception of ei-
ther a specific interrupt (see Table 5, “Interrupt
Mapping,” on page 26) or a RESET. When exiting
HALT mode by means of a RESET or an interrupt,
the oscillator is immediately turned on and the
4096 CPU cycle delay is used to stabilize the os-
cillator. After the start up delay, the CPU resumes
operation by servicing the interrupt or by fetching
the reset vector which woke it up (see Figure 19).
When entering HALT mode, the I bit in the CC reg-
ister is forced to 0 to enable interrupts. Therefore,
if an interrupt is pending, the MCU wakes immedi-
ately.
In the HALT mode the main oscillator is turned off
causing all internal processing to be stopped, in-
cluding the operation of the on-chip peripherals.
All peripherals are not clocked except the ones
which get their clock supply from another clock
generator (such as an external or auxiliary oscilla-
tor).
The compatibility of Watchdog operation with
HALT mode is configured by the “WDGHALT” op-
tion bit of the option byte. The HALT instruction
when executed while the Watchdog system is en-
abled, can generate a Watchdog RESET (see
Section 15.1 "OPTION BYTES" on page 133 for
more details).
Figure 19. HALT Mode Timing Overview
Figure 20. HALT Mode Flow-chart
Notes:
1. WDGHALT is an option bit. See option byte sec-
tion for more details.
2. Peripheral clocked with an external clock source
can still be active.
3. Only some specific interrupts can exit the MCU
from HALT mode (such as external interrupt). Re-
fer to Table 5, “Interrupt Mapping,” on page 26 for
more details.
4. Before servicing an interrupt, the CC register is
pushed on the stack. The I bit of the CC register is
set during the interrupt routine and cleared when
the CC register is popped.
HALT
RUN
4096 CPU CYCLE
DELAY
RESET
OR
INTERRUPT
HALT
INSTRUCTION
FETCH
VECTOR
HALT INSTRUCTION
RESET
INTERRUPT 3)
Y
N
Y
CPU
OSCILLATOR
PERIPHERALS 2)
I BIT
OFF
0
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
I BIT
ON
OFF
1
ON
CPU
OSCILLATOR
PERIPHERALS
I BIT
ON
X 4)
ON
4096 CPU CLOCK CYCLE
DELAY
WATCHDOG
ENABLE
DISABLE
WDGHALT 1)
0
WATCHDOG
RESET
1
相关PDF资料
PDF描述
ST72C104G2B5 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
ST72C104G1M6 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28
ST72C104G1B5 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
ST72C104G1M5 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28
ST72C104G2M3 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28
相关代理商/技术参数
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ST72C216G1M6 功能描述:8位微控制器 -MCU Flash 4K SPI/I2C 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
ST72C254G1B6 功能描述:8位微控制器 -MCU Flash 4K SPI/I2C 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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ST72C254G2B1 制造商:STMicroelectronics 功能描述:8-BIT MICROCONTROLLER - Bulk
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