topic Problems with SPI0 pin reassignment at MC9S08PA32 in 8-bit Microcontrollers https://community.nxp.com/t5/8-bit-Microcontrollers/Problems-with-SPI0-pin-reassignment-at-MC9S08PA32/m-p/391562#M21270 <HTML><HEAD></HEAD><BODY><P style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">Hello everybody.</P><P style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">I'm having problems with SPI0 pin reassignment at MC9S08PA32.</P><P style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">I am unable to change SYS_SOPT1 register. Why I can't change this register?</P><P style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">My assembly code is:</P><P style="min-height: 8pt; padding: 0px; font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">&nbsp;</P><P>LDA SYS_SOPT1</P><P>ORA #mSYS_SOPT1_SPI0PS</P><P>STA SYS_SOPT1 ;Directs the SPI0 port for PORTE</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Afer I write this register, the value of this register doesn't change.</P><P>Does anybody know what is the problem? Is there a password to change this register like there is for to change the watchdogs registers?</P></BODY></HTML> Wed, 29 Jul 2015 10:46:54 GMT fernandolima 2015-07-29T10:46:54Z Problems with SPI0 pin reassignment at MC9S08PA32 https://community.nxp.com/t5/8-bit-Microcontrollers/Problems-with-SPI0-pin-reassignment-at-MC9S08PA32/m-p/391562#M21270 <HTML><HEAD></HEAD><BODY><P style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">Hello everybody.</P><P style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">I'm having problems with SPI0 pin reassignment at MC9S08PA32.</P><P style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">I am unable to change SYS_SOPT1 register. Why I can't change this register?</P><P style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">My assembly code is:</P><P style="min-height: 8pt; padding: 0px; font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif; color: #51626f;">&nbsp;</P><P>LDA SYS_SOPT1</P><P>ORA #mSYS_SOPT1_SPI0PS</P><P>STA SYS_SOPT1 ;Directs the SPI0 port for PORTE</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Afer I write this register, the value of this register doesn't change.</P><P>Does anybody know what is the problem? Is there a password to change this register like there is for to change the watchdogs registers?</P></BODY></HTML> Wed, 29 Jul 2015 10:46:54 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Problems-with-SPI0-pin-reassignment-at-MC9S08PA32/m-p/391562#M21270 fernandolima 2015-07-29T10:46:54Z Re: Problems with SPI0 pin reassignment at MC9S08PA32 https://community.nxp.com/t5/8-bit-Microcontrollers/Problems-with-SPI0-pin-reassignment-at-MC9S08PA32/m-p/391563#M21271 <HTML><HEAD></HEAD><BODY><P>Hello Fernando, </P><P></P><P>Please be aware that the <STRONG>SYS_SOPT1</STRONG> is a <STRONG>write-once</STRONG> register.</P><P></P><P>Make sure you don’t write this register before the lines mentioned. </P><P></P><P></P><P>If the problem is still there, please let me know, I am glad to help.</P><P></P><P>Have a great day. :smileyhappy:</P><P></P><P>David.</P></BODY></HTML> Wed, 05 Aug 2015 19:41:07 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Problems-with-SPI0-pin-reassignment-at-MC9S08PA32/m-p/391563#M21271 david_diaz 2015-08-05T19:41:07Z