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參數(shù)資料
| 型號： | STR912FAW32H6T |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | ARM966E-S⑩ 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA |
| 中文描述： | ARM966E -虜⑩16/32位閃存微控制器與以太網(wǎng)，USB，加拿大，交流電機(jī)控制，4個定時器，模數(shù)轉(zhuǎn)換器，RTC和DMA的 |
| 文件頁數(shù)： | 25/99頁 |
| 文件大小： | 979K |
| 代理商： | STR912FAW32H6T |
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STR91xFAx32 STR91xFAx42 STR91xFAx44
Functional overview
25/99
3.13
System supervisor
The STR91xFA monitors several system and environmental inputs and will generate a
global reset, a system reset, or an interrupt based on the nature of the input and
configurable settings. A global reset clears all functions on the STR91xFA, a system reset
will clear all but the Clock Control Unit (CCU) settings and the system status register. At any
time, firmware may reset individual on-chip peripherals. System supervisor inputs include:
GR: CPU voltage supply (V
DD
) drop out or brown out
GR: I/O voltage supply (V
DDQ
) drop out or brown out
GR: Power-Up condition
SR: Watchdog timer timeout
SR: External reset pin (RESET_INn)
SR: JTAG debug reset command
●
●
●
●
●
●
Note:
GR: means the input causes Global Reset, SR: means the input causes System Reset
The CPU may read a status register after a reset event to determine if the reset was caused
by a watchdog timer timeout or a voltage supply drop out. This status register is cleared only
by a power up reset.
3.13.1
Supply voltage brownout
Each operating voltage source (V
DD
and V
DDQ
) is monitored separately by the Low Voltage
Detect (LVD) circuitry. The LVD will generate an early warning interrupt to the CPU when
voltage sags on either V
DD
or V
DDQ
voltage inputs. This is an advantage for battery powered
applications because the system can perform an orderly shutdown before the batteries
become too weak. The voltage trip point to cause a brown out interrupt is typically 0.25V
above the LVD dropout thresholds that cause a reset.
CPU firmware may prevent all brown-out interrupts by writing to interrupt mask registers at
run-time.
3.13.2
Supply voltage dropout
LVD circuitry will always cause a global reset if the CPU’s V
DD
source drops below it’s fixed
threshold of 1.4V.
However, the LVD trigger threshold to cause a global reset for the I/O ring’s V
DDQ
source is
set to one of two different levels, depending if V
DDQ
will be operated in the range of 2.7V to
3.3V, or 3.0V to 3.6V. If V
DDQ
operation is at 2.7V to 3.3V, the LVD dropout trigger threshold
is 2.4V. If V
DDQ
operation is 3.0V and 3.6V, the LVD threshold is 2.7V. The choice of trigger
level is made by STR91xFA device configuration software from STMicroelectronics or IDE
from 3rd parties, and is programmed into the STR91xFA device along with other
configurable items through the JTAG interface when the Flash memory is programmed.
CPU firmware may prevent some LVD resets if desired by writing a control register at run-
time. Firmware may also disable the LVD completely for lowest-power operation when an
external LVD device is being used.
3.13.3
Watchdog timer
The STR91xFA has a 16-bit down-counter (not one of the four TIM timers) that can be used
as a watchdog timer or as a general purpose free-running timer/counter. The clock source is
the peripheral clock from the APB, and an 8-bit clock pre-scaler is available. When enabled
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STR912FAW32X6 | 功能描述:ARM微控制器 - MCU ARM7TDMI 32-Bit Flash Based MCU RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| STR912FAW32X6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ARM966E-S⑩ 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA |
| STR912FAW34H6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ARM966E-S⑩ 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA |
| STR912FAW34X6 | 功能描述:ARM微控制器 - MCU ARM966E S 16/32B Flash MCU RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| STR912FAW34X6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ARM966E-S⑩ 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA |
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