ColdFire/68K Microcontrollers and ProcessorsのトピックRe: What is the minimum driving strength (mA) for external driver to properly do reset configuration of the ColdFire/MCF54418CMJ250 (pins: BOOTMOD[1:0], FB_AD[7:0])? Thanks. https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/What-is-the-minimum-driving-strength-mA-for-external-driver-to/m-p/674669#M13228 <HTML><HEAD></HEAD><BODY><P>MCF54418 Data Sheet.</P><P></P><P>"Table 5. MCF5441x Signal information and muxing" shows BOOTMOD[1:0] and FB_AD[7:0] don't have pullups or pulldowns. FB_AD[15:8] do have Pulls on Reset though.</P><P></P><P>Section "Table 11. I/O electrical specifications" gives the "Input Leakage Current" for the pins.</P><P></P><P>If you look at the Reference Manuals, they usually say things like "The logic levels for reset configuration on FB_AD[7:0] must be actively driven when BOOTMOD equals 01". Then you check the Reference Designs and the Development Modules and find they often just use pullup or pulldown resistors on these pins. I've noted this here:</P><P></P><P><A class="jive-link-comment-small" href="https://community.nxp.com/thread/100188?commentID=100980#comment-100980">https://community.nxp.com/message/100980?commentID=100980#comment-100980</A></P><P></P><P>Tom</P></BODY></HTML> Mon, 05 Jun 2017 05:45:11 GMT TomE 2017-06-05T05:45:11Z What is the minimum driving strength (mA) for external driver to properly do reset configuration of the ColdFire/MCF54418CMJ250 (pins: BOOTMOD[1:0], FB_AD[7:0])? Thanks. https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/What-is-the-minimum-driving-strength-mA-for-external-driver-to/m-p/674668#M13227 <HTML><HEAD></HEAD><BODY><P>What is the minimum driving strength (mA) for external driver to properly do reset configuration of the ColdFire/MCF54418CMJ250 (pins: BOOTMOD[1:0], FB_AD[7:0])? Thanks.</P></BODY></HTML> Mon, 05 Jun 2017 05:09:13 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/What-is-the-minimum-driving-strength-mA-for-external-driver-to/m-p/674668#M13227 davidwong 2017-06-05T05:09:13Z Re: What is the minimum driving strength (mA) for external driver to properly do reset configuration of the ColdFire/MCF54418CMJ250 (pins: BOOTMOD[1:0], FB_AD[7:0])? Thanks. https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/What-is-the-minimum-driving-strength-mA-for-external-driver-to/m-p/674669#M13228 <HTML><HEAD></HEAD><BODY><P>MCF54418 Data Sheet.</P><P></P><P>"Table 5. MCF5441x Signal information and muxing" shows BOOTMOD[1:0] and FB_AD[7:0] don't have pullups or pulldowns. FB_AD[15:8] do have Pulls on Reset though.</P><P></P><P>Section "Table 11. I/O electrical specifications" gives the "Input Leakage Current" for the pins.</P><P></P><P>If you look at the Reference Manuals, they usually say things like "The logic levels for reset configuration on FB_AD[7:0] must be actively driven when BOOTMOD equals 01". Then you check the Reference Designs and the Development Modules and find they often just use pullup or pulldown resistors on these pins. I've noted this here:</P><P></P><P><A class="jive-link-comment-small" href="https://community.nxp.com/thread/100188?commentID=100980#comment-100980">https://community.nxp.com/message/100980?commentID=100980#comment-100980</A></P><P></P><P>Tom</P></BODY></HTML> Mon, 05 Jun 2017 05:45:11 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/What-is-the-minimum-driving-strength-mA-for-external-driver-to/m-p/674669#M13228 TomE 2017-06-05T05:45:11Z