In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mgreen wrote:

The datasheet is very clear that MCLR should be connected to Vdd using a 10K pull-up resistor and not connected directly to Vdd.  I can only guess that connecting MCLR directly to Vdd can potentially cause damage or instability during startup or brownout.  Since this pin is also used for Vpp, it may be missing the protective diode to Vdd and that might be part of it.

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