How do I set my SPI frequency?
First, select the SPI clock frequency using the baud rate select bits (SPR1-SPR0). Then configure the clock with the clock polarity bit (CPOL) and clock phase bit (CPHA). Select the mode for each SPI using the SPI master bit (SPMSTR). Set the bit to 1 for the master SPI and 0 for the slave SPI.
How fast can SPI transfer data?
60 Mbps
The SPI bus can run at high speed, transferring data at up to 60 Mbps over short distances like between chips on a board.
How is SPI clock frequency calculated?
The SPI output frequency can only be equal to some values. This is due because the SPI output frequency is divided by a prescaler which is equal to 2, 4, 8, 16, 32, 64, 128 or 256.
What happens when mode fault is enabled in SPI?
Exception conditions –Mode Fault • If the SSEL signal goes active, when the SPI block is a master, this indicates another master has selected the same device to be a slave. This condition is known as a mode fault. When a mode fault is detected, the mode fault (MODF) bit in the status register will be activated.
What’s the maximum clock frequency for SPI interface?
For integrated circuits that use SPI interface, they specify maximum clock frequency in their datasheets such as attached below. The question is that if the datasheet speficies the maximum frequency as 6MHz, can I decide that it will be safe to set up clock speed exactly at 6MHz(accuracy determined…
Is it safe to set up clock speed at 6MHz?
The question is that if the datasheet speficies the maximum frequency as 6MHz, can I decide that it will be safe to set up clock speed exactly at 6MHz (accuracy determined by crystal used for MCU)? Or It is safer to have some margin?
Is it possible to get a 6 MHz chip to work?
No, 6 MHz is guaranteed to work by the specification. In practice you will very likely find devices which can work up to 8 or even 10 MHz. But it is not guaranteed that that will always work for all power supply voltages, temperatures and all chips from any batch. The 6 MHz however is guaranteed over all conditions.