I just realized that PIC16F887 (80 THB) costs less than half of PIC16F877A (200 THB).
The PIC16F887 is also comming with internal oscillators (8MHz, 32KHz). It's very nice for watch projects as it doesn't need external components.
After some searches, I have found a good info about PIC16F887 & PIC16F877A issue: Hello PIC16F887 MCUs- goodbye PIC16F877A! CCS News
From now on, I will use PIC16F887.
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