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If you are dedicated to that chip ie… requirement at work etc... You'll struggle. BUT! if its' for you to get into micro's then AVR or PIC will be a far better choice.... I believe the Holtek chips are very robust and developed for the industrial world... But as you have found out already, hardly any support..
Sir, we were using pic controller for domestic circuits, but due to price constraints and also as both of them had almost similar features, we decided to go for holtek.
And I will surely go through the link you have provided.