topic [LPC824] SCT PWM at 25KHz. MATCHREL and MATCH registers usage in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC824-SCT-PWM-at-25KHz-MATCHREL-and-MATCH-registers-usage/m-p/565869#M17184 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by ramniraj10 on Mon Dec 08 04:56:23 MST 2014</STRONG><BR /><SPAN>From Aplication manual, MATCH1 counter register is updated from MATCHREL1 when MATCH0 reaches 0.</SPAN><BR /><SPAN>So, if we load MATCHREL1 with some value when MATCH1 is not 0, is it ok to do this?</SPAN><BR /><BR /><SPAN>I am trying to do multiplexing PWM out pin, so loading MATCHREL1 after each complete cycle is required. When MATCH1 reaches 0 i want value in MATCHREL1 to be next value which should be loaded into MATCH1.</SPAN><BR /><BR /><SPAN>Application: Multiplexing 256 leds and refresh rate 100 Hz.</SPAN><BR /><SPAN>PWM frequency 25600 Hz</SPAN><BR /><SPAN>so that, each PWM cycle represents a single led. Scanning is done like in steps below:</SPAN><BR /><SPAN>1. Update MATCHREL1.</SPAN><BR /><SPAN>2. Start SCT</SPAN><BR /><SPAN>3. When MATCH1 reaches 0, SCT ISR is called where update from MATCHREL1. (MATCH1 will automatically reloaded from MATCHEL1) in next PWM cycle.</SPAN><BR /><BR /><SPAN>Please suggest if this implementation is OK?</SPAN><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 20:05:18 GMT lpcware 2016-06-15T20:05:18Z [LPC824] SCT PWM at 25KHz. MATCHREL and MATCH registers usage https://community.nxp.com/t5/LPC-Microcontrollers/LPC824-SCT-PWM-at-25KHz-MATCHREL-and-MATCH-registers-usage/m-p/565869#M17184 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by ramniraj10 on Mon Dec 08 04:56:23 MST 2014</STRONG><BR /><SPAN>From Aplication manual, MATCH1 counter register is updated from MATCHREL1 when MATCH0 reaches 0.</SPAN><BR /><SPAN>So, if we load MATCHREL1 with some value when MATCH1 is not 0, is it ok to do this?</SPAN><BR /><BR /><SPAN>I am trying to do multiplexing PWM out pin, so loading MATCHREL1 after each complete cycle is required. When MATCH1 reaches 0 i want value in MATCHREL1 to be next value which should be loaded into MATCH1.</SPAN><BR /><BR /><SPAN>Application: Multiplexing 256 leds and refresh rate 100 Hz.</SPAN><BR /><SPAN>PWM frequency 25600 Hz</SPAN><BR /><SPAN>so that, each PWM cycle represents a single led. Scanning is done like in steps below:</SPAN><BR /><SPAN>1. Update MATCHREL1.</SPAN><BR /><SPAN>2. Start SCT</SPAN><BR /><SPAN>3. When MATCH1 reaches 0, SCT ISR is called where update from MATCHREL1. (MATCH1 will automatically reloaded from MATCHEL1) in next PWM cycle.</SPAN><BR /><BR /><SPAN>Please suggest if this implementation is OK?</SPAN><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 20:05:18 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC824-SCT-PWM-at-25KHz-MATCHREL-and-MATCH-registers-usage/m-p/565869#M17184 lpcware 2016-06-15T20:05:18Z