Arm China STAR-MC1 processor

[ataradov]

A bit confusing, and quite a jump.
Sometimes vendors have higher CLKs for PWM blocks, for finer PWM steps, maybe it's related to that ?

No, they specifically mention "The maximum frequency of the AHB and the APB domains is 168MHZz." ("MHZz" is in the datasheet ). The core is in the AHB domain, so presumably can run at this clock.

This looks like some extreme overclocking, most likely at the expense of reliability.

[koendv]

It looks like a generic STM32, until you look closer.
- Clock generation is completely different, allowing for higher speeds.
- STM32 spi can do spi frames from 4 to 16 bits. The MM32 SPI has an extra register, where you can set frame sizes from 1 to 32 bit

If I compare the Star-MC1 MM32F5270 with the Cortex-M3 MM32F3270, I get the following impression.
- the F3270 has 128 kbyte ram at 0x20000000, and 512 kbyte flash.
- they ripped out the Cortex-M3 core and replaced it with the Star-MC1
- but the Star-MC1 has 32kbyte tightly coupled ram at 0x2000000 e.g. for stack
- so they moved the 128 kbyte ram to 0x3000000
- space got a bit tight, so they lowered the amount of flash from 512kbyte to 256kbyte.
But this is just the impression I get.