spi minimum and maximum rate?in HZ form and bits (bits per sec.) form ?

[gajendra_808]

any body tell me ....

spi minimum and maximum rate?in HZ form and bits (bits per sec.) form ?

 

[ckshivaram]

the SPI clock range is adjustable from. 500 KHz to 50 MHz. A maximum data rate of. 50 Mbit/sec can be achieved with a clock speed of 50 MHz

---------- Post added at 17:27 ---------- Previous post was at 17:20 ----------

these calculations are done based on the crystal oscillator frequency supported by the controller

 

[Embedded Partner]

Maximum/minimum baud rate that can be achieved is dependent on the processor clock speed. Faster processor speed supports fast SPI transfer.

 

[ckshivaram]

SPI speed is set by the prescalar circuit which has the divisor factor with which the oscillator frequency is divided.... usually it is 1/4th of oscillator frequency

 

[Embedded Partner]

SPI speed is set by the prescalar circuit which has the divisor factor with which the oscillator frequency is divided.... usually it is 1/4th of oscillator frequency

it will differ from one controller to other,

 

[ckshivaram]

it will differ from one controller to other,
in case of ARM it 1/4th of the peripheral frequency by default

not by default....... it can be changed by changing the prescaler value. and same thing in any controller.....

 

[Embedded Partner]

not by default....... it can be changed by changing the prescaler value. and same thing in any controller.....

prescalar value doesn't change the SPI clock rate ......

---------- Post added at 10:00 ---------- Previous post was at 09:59 ----------

The SPI SCK rate may be calculated as: PCLK of SPI / SPI clock counter register value

---------- Post added at 10:02 ---------- Previous post was at 10:00 ----------

SPI clock control register controls the frequency of a master’s SCK

---------- Post added at 10:03 ---------- Previous post was at 10:02 ----------

in ARM this register must be an even number greater than or equal to 8.

 

[ckshivaram]

get to basics and find out relation between data rate and prescaler configuration or dig the startup code and see what happens.....

---------- Post added at 18:52 ---------- Previous post was at 18:50 ----------

also please find out the affect of prescaler on the performance of the controller and its data rate and how it affects the data rate.. i never told that it changes all the parameters of SPI.

---------- Post added at 18:54 ---------- Previous post was at 18:52 ----------

got the formula from data sheet... ???????? but understanding of it is also important dear embedded partner

---------- Post added at 18:56 ---------- Previous post was at 18:54 ----------

and how it works other than ARM????? in any 8 bit or 16 bit controller??????

if prescaler is not required then it was not required in the design itself.........