參數(shù)資料
型號(hào)： ST72T2311R6T6S
廠商： 意法半導(dǎo)體
英文描述： 8-BIT MCU WITH NESTED INTERRUPTS, EEPROM, ADC, 16-BIT TIMERS, 8-BIT PWM ART, SPI, SCI, CAN INTERFACES
中文描述： 8位嵌套中斷，EEPROM存儲(chǔ)器，模數(shù)轉(zhuǎn)換器，16位定時(shí)器，8位PWM藝術(shù)，SPI和脊髓損傷，微控制器的CAN接口
文件頁(yè)數(shù)： 95/164頁(yè)
文件大小： 1043K
代理商： ST72T2311R6T6S
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ST72311R, ST72511R, ST72512R, ST72532R
36/164
POWER SAVING MODES (Cont’d)
7.4 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).
7.4.1 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 52 for more details on the MCCSR
register).
The MCU can exit ACTIVE-HALT mode on recep-
tion of either an MCC/RTC interrupt, a specific in-
terrupt (see Table 7, “Interrupt Mapping,” on
page 32) or a RESET. When exiting ACTIVE-
HALT mode by means of a RESET or an interrupt,
a 4096 CPU cycle delay occurs. 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 22).
When entering ACTIVE-HALT mode, the I[1:0] bits
in the CC register are forced to ‘10’ to enable inter-
rupts. 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.
Figure 21. ACTIVE-HALT Timing Overview
Figure 22. ACTIVE-HALT Mode Flow-chart
Notes:
1. Peripheral clocked with an external clock source
can still be active.
2. Only the MCC/RTC interrupt and some specific
interrupts can exit the MCU from ACTIVE-HALT
mode (such as external interrupt). Refer to
Table 7, “Interrupt Mapping,” on page 32 for more
details.
3. 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
4096 CPU CYCLE
DELAY
RESET
OR
INTERRUPT
HALT
INSTRUCTION
FETCH
VECTOR
ACTIVE
[MCCSR.OIE=1]
HALT INSTRUCTION
RESET
INTERRUPT 2)
Y
N
Y
CPU
OSCILLATOR
PERIPHERALS 1)
I[1:0] BITS
ON
OFF
10
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
OFF
XX 3)
ON
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
XX 3)
ON
4096 CPU CLOCK CYCLE
DELAY
(MCCSR.OIE=1)
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ST72T251G1B6 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72T251G1M6 功能描述:8位微控制器 -MCU RO 511-ST72C254G1M6 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72T251G2B6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72T251G2M6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72T311J2B6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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