Prescale

[Emanuel Lourenco]

Good Morning

I am amateur in the area and I am not understanding what is the prescale.
For example when adding the SPI component.
Could you possibly can explain me grateful.

Greetings
Emanuel Lourenço

[Benj]

Hello,

The SPI prescale is a division of the master instruction clock. So say the oscillator is running at 4MHz.

PIC 8-Bit & dsPIC30 = Instruction clock = Osc / 4 = 1MHz

PIC24 / dsPIC33 = Instruction clock = Osc / 2 = 2MHz

AVR = Instruction clock = Osc = 4MHz

So an 8-bit PIC with an Osc speed of 4MHz and a prescaler of 4 the SPI clock would be equal to 250K bits per sec when sending or receiving data.

[Emanuel Lourenco]

Hello,

The SPI prescale is a division of the master instruction clock. So say the oscillator is running at 4MHz.

PIC 8-Bit & dsPIC30 = Instruction clock = Osc / 4 = 1MHz

PIC24 / dsPIC33 = Instruction clock = Osc / 2 = 2MHz

AVR = Instruction clock = Osc = 4MHz

So an 8-bit PIC with an Osc speed of 4MHz and a prescaler of 4 the SPI clock would be equal to 250K bits per sec when sending or receiving data.

Thanks for the explanation
I think I understood.
So if I have a dsPIC33 clocked at 4 MHz, and a prescale of osc / 4.
I'll take 500 kbits per second right?

Greetings

[Benj]

So if I have a dsPIC33 clocked at 4 MHz, and a prescale of osc / 4.
I'll take 500 kbits per second right?

Sounds right to me

4MHz / 2 / 4 = 500KHz.

[Emanuel Lourenco]

So if I have a dsPIC33 clocked at 4 MHz, and a prescale of osc / 4.
I'll take 500 kbits per second right?

Sounds right to me

4MHz / 2 / 4 = 500KHz.

Thanks for the explanation
Very good explanation