topic High clock rate of LPC1788-SPI performs error in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/High-clock-rate-of-LPC1788-SPI-performs-error/m-p/521832#M4468 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by qq on Wed Jul 22 00:20:04 MST 2015</STRONG><BR /><SPAN>Hello!</SPAN><BR /><SPAN>I have configured an LPC1788 as SPI master on SSP1 (CPOL = 0; CPHA = 0) to communicate with a Nor Flash chip at 20 MHz.The Nor Flash chip needs the chip select pulled down (I do that with a GPIO), then a byte of command data need to be transmitted and some bytes of data need to be read and then the chip select needs to be pulled up again.</SPAN><BR /><SPAN>So I use Chip_SSP_WriteFrames_Blocking() function to send any data and the data does get transmitted and </SPAN><BR /><SPAN>Chip_SSP_ReadFrames_Blocking () function to read any data from the Nor Flash accordingly.</SPAN><BR /><SPAN>So everything's fine.However, As the frequency of the SSP for more than 20 MHz, the SSP can't work properly.</SPAN><BR /><SPAN>My question is: Why the SSP can't work properly more than 20 MHz.</SPAN><BR /><SPAN>Regards!</SPAN></BODY></HTML> Wed, 15 Jun 2016 16:37:11 GMT lpcware 2016-06-15T16:37:11Z High clock rate of LPC1788-SPI performs error https://community.nxp.com/t5/LPC-Microcontrollers/High-clock-rate-of-LPC1788-SPI-performs-error/m-p/521832#M4468 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by qq on Wed Jul 22 00:20:04 MST 2015</STRONG><BR /><SPAN>Hello!</SPAN><BR /><SPAN>I have configured an LPC1788 as SPI master on SSP1 (CPOL = 0; CPHA = 0) to communicate with a Nor Flash chip at 20 MHz.The Nor Flash chip needs the chip select pulled down (I do that with a GPIO), then a byte of command data need to be transmitted and some bytes of data need to be read and then the chip select needs to be pulled up again.</SPAN><BR /><SPAN>So I use Chip_SSP_WriteFrames_Blocking() function to send any data and the data does get transmitted and </SPAN><BR /><SPAN>Chip_SSP_ReadFrames_Blocking () function to read any data from the Nor Flash accordingly.</SPAN><BR /><SPAN>So everything's fine.However, As the frequency of the SSP for more than 20 MHz, the SSP can't work properly.</SPAN><BR /><SPAN>My question is: Why the SSP can't work properly more than 20 MHz.</SPAN><BR /><SPAN>Regards!</SPAN></BODY></HTML> Wed, 15 Jun 2016 16:37:11 GMT https://community.nxp.com/t5/LPC-Microcontrollers/High-clock-rate-of-LPC1788-SPI-performs-error/m-p/521832#M4468 lpcware 2016-06-15T16:37:11Z