LPC MicrocontrollersのトピックISP pin https://community.nxp.com/t5/LPC-Microcontrollers/ISP-pin/m-p/522682#M5318 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by jdurand on Thu Sep 06 14:00:11 MST 2012</STRONG><BR /><SPAN>I've noticed on several different parts the pin that is pulled low to enter ISP by default has a pullup resistor like most pins.&nbsp; But, the user manual says the pin is floating and needs an external pullup.</SPAN><BR /><BR /><SPAN>I normally put the pullup on my boards but was wondering which was correct.</SPAN><BR /><BR /><SPAN>I understand if there's a lot of capacitance on the pin that it might not come up fast enough, but with the standard RESET input (10K external pullup + 0.1uF capacitor) I would think in almost all cases the ISP pin would be high long before the RESET was released.</SPAN><BR /><BR /><SPAN>Is this correct?</SPAN></BODY></HTML> Wed, 15 Jun 2016 16:40:29 GMT lpcware 2016-06-15T16:40:29Z ISP pin https://community.nxp.com/t5/LPC-Microcontrollers/ISP-pin/m-p/522682#M5318 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by jdurand on Thu Sep 06 14:00:11 MST 2012</STRONG><BR /><SPAN>I've noticed on several different parts the pin that is pulled low to enter ISP by default has a pullup resistor like most pins.&nbsp; But, the user manual says the pin is floating and needs an external pullup.</SPAN><BR /><BR /><SPAN>I normally put the pullup on my boards but was wondering which was correct.</SPAN><BR /><BR /><SPAN>I understand if there's a lot of capacitance on the pin that it might not come up fast enough, but with the standard RESET input (10K external pullup + 0.1uF capacitor) I would think in almost all cases the ISP pin would be high long before the RESET was released.</SPAN><BR /><BR /><SPAN>Is this correct?</SPAN></BODY></HTML> Wed, 15 Jun 2016 16:40:29 GMT https://community.nxp.com/t5/LPC-Microcontrollers/ISP-pin/m-p/522682#M5318 lpcware 2016-06-15T16:40:29Z