Hardeep, I believe what the manual is trying to say is that the ESSI will accept a gated clock input generated by an external device. Meaning the ESSI does not require a continuous clock to operate properly. However, the ESSI hardware is not capable of generating a gated clock output. At least this is the case for the 56300 Family which I believe is extremely similar with repsect to ESSI operation. -- dB --- hardeepgida <> wrote: > > I contacted freescale and they provided me with the following > response (This may help others who are trying to figure out > continuos/gated clock modes. The reason why this is confusing is > because in the pin descriptions chapter of the manual, freescale > mentions that continuous and gated clocks are possible, but in the > ESSI chapter, it does not mention anything about the gated clocks > option): > > The ESSI peripheral will only generate a continuous clock. By gated > clock, it means that the peripheral internal hardware will ignore > bit clocks that occur on a clock input when they are outside of a > valid frame. Some external devices require a gated clock to operate > and if they cannot generate the gated clock themselves, external > logic will be needed if the DSP is to generate it. > > Thanks. > Hardeep > --- In , "hardeepgida" <hgida@i...> wrote: > > > > Hi, > > > > I am a "newbie" using the ESSI on the DSP56858(programmed by > > Codewarrior + Processor Expert). In the manual it says that the > > serial clock on the ESSI is continous (which i'm assuming means > that > > it is on at all times). However, what I would like it to do is the > > following: When chip select is high, the clock should be off. When > > chip select is low, the clock should turn on. Is there a register > > that controls this continuous/non-continous functionality of the > > clock? Is there a way that I can somehow programmably AND the Chip > > select signal and serial Clock signal so that I can turn the clock > > on and off? Would I have to use a hardware AND gate? > > > > Thank you. > > Hardeep > > __________________________________ |