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Do microcontrollers store data?
Just like in a computer, RAM will be used in a microcontroller to store data and other results that are created while your microcontroller is at work. And when you cut the power on your microcontroller, the memory in your RAM gets erased.
How much memory does a microcontroller have?
The MSP430 does not have an external memory bus, so it is limited to on-chip memory (up to 512 KB flash memory and 66 KB RAM) which may be too small for applications that require large buffers or data tables.
How does cache work?
Cached data works by storing data for re-access in a device’s memory. The data is stored high up in a computer’s memory just below the central processing unit (CPU). When the browser is active, the resources it retrieves are stored in its random access memory (RAM) or its hard drive.
Why does a processor not have a cache controller?
A real-time embedded processor may choose not to have a built-in cache and cache controller. Instead, it may choose to utilize the on-chip SRAM memory as a scratch pad that can be used to store frequently used code by using software overlays. Each code section mapped onto an overlay has a run space and live space.
What kind of memory does a microcontroller have?
A microcontroller contains one or more CPUs (processor cores) along with memory and programmable input/output peripherals. Program memory in the form of ferroelectric RAM, NOR flash or OTP ROM is also often included on chip, as well as a small amount of RAM.
How are cache controllers responsible for cache coherence?
Snoopy protocols distribute the responsibility for cache coherence between all cache controllers. Some mechanism must be incorporated so that each cache knows when a line is also in another cache. If this line is subsequently updated, it must inform the other caches that this update has taken place.
When does the cache controller change the exclusive state?
If no signals are returned, the initiating cache controller can set the “exclusive” state. If at least one signal is returned, the initiating cache controller must set the “shared” state. If another cache has an exclusive copy of this line, it too must change the state to shared.