Цитата(firew0rker @ May 31 2017, 05:47)
Вы пока не пробовали запускать встроенный в МК генератор, рассчитанный на кварц, с колебательным контуром, образованным вашим датчиком и катушкой? Если получится, то партия 250шт катушек будет стоить недорого.
Вероятно я что-то не понимаю.
HSI я использую как тактовую частоту
LSI - как источник тактовой для сна
к HSE подключаю внешний колебательный контур. допустим, схемотехника HSE позволяет работать генератору на частотах в десятки килогерц.
Но, дальше стоит переключатель источника тактовой частоты, и там нет нескольких каналов.
поясните пожалуйста.
Clock controller
The clock controller distributes the system clock (fMASTER) coming from different oscillators
to the core and the peripherals. It also manages clock gating for low power modes and
ensures clock robustness.
Features
•
Clock prescaler
:
To get the best compromise between speed and current
consumption the clock frequency to the
CPU and peripherals can be adjusted by a
programmable prescaler.
•
Safe clock switching
:
Clock sources can be changed safely on the fly in run mode
through a configuration register. The clock
signal is not switched until the new clock
source is ready. The design guarantees glitch-free switching.
•
Clock management
:
To reduce power consumption, th
e clock controller can stop the
clock to the core, individual peripherals or memory.
•
Master clock sources
:
Four different clock sources can be used to drive the master
clock:
–
1-16 MHz high-speed external crystal (HSE)
–
Up to 16 MHz high-speed user-external clock (HSE user-ext)
–
16 MHz high-speed internal RC oscillator (HSI)
–
128 kHz low-speed internal RC (LSI)
•
Startup clock
:
After reset, the microcontroller restarts by default with an internal
2 MHz clock (HSI/8). The prescaler ratio
and clock source can
be changed by the
application program as soon as the code execution starts.
•
Clock security system (CSS)
:
This feature can be enabled by software. If an HSE
clock failure occurs, the internal RC (16 MH
z/8) is automatically selected by the CSS
and an interrupt can optionally be generated.
•
Configurable main clock output (CCO)
:
This outputs an external clock for use by the
application.
