Looking at the documents on the chips, I did not find any significant differences. Tell me please how they differ, and which model is preferable 003 or 903?
From the specifications, the STM8S903 has more EEPROM and more A/D converters.
Yes, the differences are almost invisible but quite significant. These differences also include the presence of the reference voltage source and the serial number. And still a more advanced timer and I / O crossing. But I did not notice it, first.
Regarding comparison of STM8S903 and STM8S003, I would like to highlight one more thing. The difference between these devices is not only about number of peripherals and capacity of memory. Please note, that STM8S003 belongs to so called Value Line of MCUs. Such devices are offered in very attractive price, but this benefit is a result of smaller numbers of post production tests. As a result some parameters of Value Line MCUs are not as good as in regular MCUs. These parameters are:
The "normal" families are 103 and 003.
903 is an application specific family. The biggest feature of it is the timers that can be synchronized. They even had different numbering, 903 having TIM1, TIM5 and TIM6.
In the general user manual of STM8S, the synchronization of the timers is explained in detail, yet it works only with TIM1+TIM5/TIM6 which is available only in the 903.
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