topic Timer/RIT: write clear interrupt flag to 1, read as 0, when? in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/Timer-RIT-write-clear-interrupt-flag-to-1-read-as-0-when/m-p/576569#M19465 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by petekol on Sun Nov 01 07:04:59 MST 2015</STRONG><BR /><SPAN>Hi </SPAN><BR /><BR /><SPAN>i have some understanding problem of clearing an interrupt flag of RIT:</SPAN><BR /><SPAN>i expect that harware clears the flag to 0 and a can read it as 0 after i write 1 to it. In practice i do not read 0 event if doing it in a loop for ever (in ISR).</SPAN><BR /><BR /><SPAN>Does it means that it is acctually cleared internally by writing 1 an i can't read it as 0 (only after exit from ISR?) but if i move compare value then it fire interrupt next time.</SPAN><BR /><BR /><SPAN>So tha question is when i should expect to read the flag as 0? Before this time and after i write 1 to it can i trigger one more compare fire (flag goes to 1)?</SPAN><BR /><BR /><SPAN>Thnx</SPAN><BR /><SPAN>Lok</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:01:59 GMT lpcware 2016-06-15T19:01:59Z Timer/RIT: write clear interrupt flag to 1, read as 0, when? https://community.nxp.com/t5/LPC-Microcontrollers/Timer-RIT-write-clear-interrupt-flag-to-1-read-as-0-when/m-p/576569#M19465 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by petekol on Sun Nov 01 07:04:59 MST 2015</STRONG><BR /><SPAN>Hi </SPAN><BR /><BR /><SPAN>i have some understanding problem of clearing an interrupt flag of RIT:</SPAN><BR /><SPAN>i expect that harware clears the flag to 0 and a can read it as 0 after i write 1 to it. In practice i do not read 0 event if doing it in a loop for ever (in ISR).</SPAN><BR /><BR /><SPAN>Does it means that it is acctually cleared internally by writing 1 an i can't read it as 0 (only after exit from ISR?) but if i move compare value then it fire interrupt next time.</SPAN><BR /><BR /><SPAN>So tha question is when i should expect to read the flag as 0? Before this time and after i write 1 to it can i trigger one more compare fire (flag goes to 1)?</SPAN><BR /><BR /><SPAN>Thnx</SPAN><BR /><SPAN>Lok</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:01:59 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Timer-RIT-write-clear-interrupt-flag-to-1-read-as-0-when/m-p/576569#M19465 lpcware 2016-06-15T19:01:59Z