perché allora non usarne una da 20k che oltre a garantire la compatibilità per il futuro comporterebbe un piccolo risparmio di corrente? In tutti gli schemi ho sempre visto 10k ]
Connecting the RESET so that it is possible to enter both high-voltage programming and ordinary low level reset can be achieved by applying a pull-up resistor to the RESET line. This pull-up resistor makes sure that reset does not go low unintended. The pull-up resistor can in theory be of any size, but if the Atmel AVR should be programmed from e.g. STK500/AVRISP the pull-up should not be so strong that the programmer cannot activate RESET by draw the RESET line low. The recommended pull-up resistor is 4.7k? or larger when using STK500 for programming. For debugWIRE to function properly, the pull-up must not be smaller than 10k?.
A low resistor value is called a strong pull-up, a high resistor value is called a weak pull-up