參數(shù)資料
型號： STR911FW44X6T
廠商： 意法半導體
英文描述： ARM966E-S TM 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA
中文描述： ARM966E - ?商標16/32位閃存微控制器與以太網，USB，加拿大，交流電機控制，4個定時器，模數(shù)轉換器，RTC和DMA的
文件頁數(shù)： 14/73頁
文件大小： 595K
代理商： STR911FW44X6T
Functional overview
STR91xF
14/73
2.10 Clock control unit (CCU)
The CCU generates a master clock of frequency f
MSTR
. From this master clock the CCU also
generates individually scaled and gated clock sources to each of the following functional blocks
within the STR91xF.
CPU, f
CPUCLK
Advanced High-performance Bus (AHB), f
HCLK
Advanced Peripheral Bus (APB), f
PCLK
Flash Memory Interface (FMI), f
FMICLK
External Memory Interface (EMI), f
BCLK
UART Baud Rate Generators, f
BAUD
USB, f
USB
●
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2.10.1 Master clock sources
The master clock in the CCU (f
MSTR
) is derived from one of three clock input sources. Under
firmware control, the CPU can switch between the three CCU inputs without introducing any
glitches on the master clock output. Inputs to the CCU are:
Main Oscillator (f
OSC
). The source for the main oscillator input is a 4 to 25 MHz external
crystal connected to STR91xF pins X1_CPU and X2_CPU, or an external oscillator device
connected to pin X1_CPU.
PLL (f
PLL
). The PLL takes the 4 to 25 MHz oscillator clock as input and generates a master
clock output up to 96 MHz (programmable). By default, at power-up the master clock is
sourced from the main oscillator until the PLL is ready (locked) and then the CPU may
switch to the PLL source under firmware control. The CPU can switch back to the main
oscillator source at any time and turn off the PLL for low-power operation. The PLL is
always turned off in Sleep mode.
RTC (f
RTC
). A 32.768 kHz external crystal can be connected to pins X1_RTC and
X2_RTC, or an external oscillator connected to pin X1_RTC to constantly run the real-time
clock unit. This 32.768 kHz clock source can also be used as an input to the CCU to run
the CPU in slow clock mode for reduced power.
●
●
●
As an option, there are a number of peripherals that do not have to receive a clock sourced
from the CCU. The USB interface can receive an external clock on pin P2.7, TIM timers TIM0/
TIM1 can receive an external clock on pin P2.4, and timers TIM2/TIM3 on pin P2.5.
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相關代理商/技術參數(shù)
參數(shù)描述
STR911FW92X6T 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ARM966E-S TM 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA
STR911FW94X6T 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ARM966E-S TM 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA
STR912-D/RAIS 功能描述:子卡和OEM板 8 BITS MICROCONTR RoHS:否 制造商:BeagleBoard by CircuitCo 產品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
STR912FAM32H6T 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
STR912FAM32X6T 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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