STM32C0 series?

[IOsetting]

There is also the PUYA <10c ARM ICs as well: https://www.lcsc.com/product-detail/Microcontroller-Units-MCUs-MPUs-SOCs_PUYA-PY32F002AA15M6TU_C5292058.html

FYI... PY32F002Ax5 actually have 32 KB of flash and 4KB of RAM available. (They are, in good chance, PY32F030 parts remarked as PY32F002A for inventory reasons.)
piotr_go of elektroda found the bonus resources on his PY32F002AA15M6TU. Last weekend I tested the newly bought PY32F002AF15P (TSSOP20 package), also confirmed the existence of 32KF, 4KR, PLL and DMA.

[DavidAlfa]

Interesting! Can be programmed with STlink or use some special flash algorithm?

[IOsetting]

Interesting! Can be programmed with STlink or use some special flash algorithm?

Partly yes, JLink and DAPLink(PyOCD) work, but STLink not.

[piotr_go]

Interesting! Can be programmed with STlink or use some special flash algorithm?

ST-LINK v2 converted to J-Link. Just put Vendor="ST" in "JLinkDevices.xml" 
https://www.elektroda.com/rtvforum/topic3946116.html