Hi fellows, I am interfacing an adc manufactured by TI with MSP 430F139.The ADC uses SCLK from MSP to tranmit 16 bits of A to D .data serially. MSP has an 8bit spi buffer so the SCLK will stop after exchanging 8 bit until its started again.The slight delay in between in the SCLK exceeds the tolerable jitter limit. Could someone help as how to supply continuous clock from MSP. There is one more fundamental doubt about devices that Use SPI as an interface: is the SCLK to be supplied continuously or only when data needs to be exchanged,because all data sheets show a coontinuous SCLK extending to infinity..? Plz help regards deepak
16 bit SPI problem
Started by ●July 22, 2003
Reply by ●July 22, 20032003-07-22
>From: "deepak" <kuldeepakasha@kuld...> >Reply-To: msp430@msp4... >To: msp430@msp4... >Subject: [msp430] 16 bit SPI problem >Date: Tue, 22 Jul 2003 15:17:15 -0000 > >Hi fellows, > >I am interfacing an adc manufactured by TI with MSP 430F139.The ADC >uses SCLK from MSP to tranmit 16 bits of A to D .data serially. > MSP has an 8bit spi buffer so the SCLK will stop after exchanging >8 bit until its started again.The slight delay in between in the SCLK >exceeds the tolerable jitter limit. > Could someone help as how to supply continuous clock from MSP. > >There is one more fundamental doubt about devices that Use SPI as an >interface: is the SCLK to be supplied continuously or only when data >needs to be exchanged,because all data sheets show a coontinuous SCLK >extending to infinity..? It shouldn't need it. I've implemented 8-bit SPI in software, with the clock disabled when it isn't needed. Leon -- Leon Heller, G1HSM Tel: +44 1424 423947 Email:leon_heller@leon... My web page: http://webspace.webring.com/people/jl/leon_heller/ _________________________________________________________________ Stay in touch with absent friends - get MSN Messenger http://www.msn.co.uk/messenger