STM8 Medium and High Density Devices
STM8S "Medium" and "High Density" devices are quite similar compared with each other, and they some enhanced features compared with STM8S "Low Density" devices (please refer to STM8 Low Density Devices for some information on product properties).
It's also noteworthy that the set of peripherals of "Medium Density" devices is a subset of "High Density" device peripherals, register addresses are the same, and the subset of common features is large.
Notable differences are:
- RAM, Flash and EEPROM capacity
- number if UARTS (1 vs. 2)
- CAN controller (or not)
Flash and EEPROM properties were upgraded compared with Low Density devices:
- read from Flash ROM is possible during EEPROM write cycles
- A Flash read wait-state allows up to 24MHz CPU clock
In "Medium Density" devices the extra wait state is an undocumented feature. A test revealed that it works for STM8S005C6T6 which indicates that it may work for all "Medium Density" devices.
More on STM8S and STM8L Medium and High density will follow here in a bit.