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參數(shù)資料
| 型號(hào)： | ST72345C4T6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, ROHS COMPLIANT, TQFP-32 |
| 文件頁(yè)數(shù)： | 215/246頁(yè) |
| 文件大?。?/td> | 2016K |
| 代理商： | ST72345C4T6 |
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Power-saving modes
ST72344xx, ST72345xx
It is entered by executing the HALT instruction when the AWUEN bit in the AWUCSR
register has been set and the OIE bit in the MCCSR register is cleared (see Section 11.2 on
page 88 for more details).
Figure 32.
AWUFH mode block diagram
As soon as Halt mode is entered, and if the AWUEN bit has been set in the AWUCSR
register, the AWU RC oscillator provides a clock signal (fAWU_RC). Its frequency is divided by
a fixed divider and a programmable prescaler controlled by the AWUPR register. The output
of this prescaler provides the delay time. When the delay has elapsed the AWUF flag is set
by hardware and an interrupt wakes-up the MCU from Halt mode. At the same time the main
oscillator is immediately turned on and a 256 or 4096 cycle delay is used to stabilize it. After
this startup delay, the CPU resumes operation by servicing the AWUFH interrupt. The AWU
flag and its associated interrupt are cleared by software reading the AWUCSR register.
To compensate for any frequency dispersion of the AWU RC oscillator, it can be calibrated
by measuring the clock frequency fAWU_RC and then calculating the right prescaler value.
Measurement mode is enabled by setting the AWUM bit in the AWUCSR register in Run
mode. This connects internally fAWU_RC to the ICAP2 input of the 16-bit timer A, allowing the
fAWU_RC to be measured using the main oscillator clock as a reference timebase.
Similarities with Halt mode
The following AWUFH mode behavior is the same as normal Halt mode:
●
The MCU can exit AWUFH mode by means of any interrupt with exit from Halt
capability or a reset (see Section 9.4: Halt mode on page 66).
●
When entering AWUFH mode, the I[1:0] bits in the CC register are forced to 10b to
enable interrupts. Therefore, if an interrupt is pending, the MCU wakes up immediately.
●
In AWUFH mode, the main oscillator is turned off causing all internal processing to be
stopped, including the operation of the on-chip peripherals. None of the peripherals are
clocked except those which get their clock supply from another clock generator (such
as an external or auxiliary oscillator like the AWU oscillator).
●
The compatibility of Watchdog operation with AWUFH mode is configured by the
WDGHALT option bit in the option byte. Depending on this setting, the HALT instruction
when executed while the Watchdog system is enabled, can generate a Watchdog
reset.
AWU RC
AWUFH
fAWU_RC
AWUFH
oscillator
prescaler
interrupt
/64
divider
to Timer input capture
/1 .. 255
相關(guān)PDF資料 |
PDF描述 |
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| ST72344K4T6 | MICROCONTROLLER, PQFP32 |
| ST72344S2T6TR | MICROCONTROLLER, PQFP44 |
| ST72344S4T6 | MICROCONTROLLER, PQFP44 |
| ST72345C4T6TR | MICROCONTROLLER, PQFP48 |
| ST72521AR7T1/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| ST72345-D/RAIS | 功能描述:子卡和OEM板 8 BITS MICROCONTR RoHS:否 制造商:BeagleBoard by CircuitCo 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| ST72361 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-bit MCU with Flash or ROM, 10-bit ADC, 5 timers, SPI, 2x LINSCI⑩ |
| ST72361_07 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-bit MCU with Flash or ROM, 10-bit ADC, 5 timers, SPI, 2x LINSCI⑩ |
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| ST72371 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCUs WITH 16K ROM/OTP/EPROM,512 BYTES RAM, ADC, DAC (PWM), TIMER, I2C AND SCI |
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