hi,
I'm newbie using microcontrollers.I was going thro' pic18f4550 datasheet.
I found the "flexible clock structure" confusing. it says
Five Crystal modes, including High-Precision PLL
for USB
Two External RC modes, up to 4 MHz
Two External Clock modes, up to 40 MHz
Internal oscillator block:
- 8 user selectable frequencies, from 31 kHz to 8 MHz
- User tunable to compensate for frequency drift
Secondary oscillator using Timer1 @ 32 kHz
I'm supposed to get data from a ADC-ads7888 serially giving a serial clk of 25Mhz.
All i wanna know is if i can use a crystal of 40Mhz for the pic18f and
derive 25Mhz by programming(toggling a port with some delay corr to 25Mhz) for the ADC Sclk.
thanks in advance,
A
I'd appreciate more if any1 could help me comprehend the text in bold
I'm newbie using microcontrollers.I was going thro' pic18f4550 datasheet.
I found the "flexible clock structure" confusing. it says
Five Crystal modes, including High-Precision PLL
for USB
Two External RC modes, up to 4 MHz
Two External Clock modes, up to 40 MHz
Internal oscillator block:
- 8 user selectable frequencies, from 31 kHz to 8 MHz
- User tunable to compensate for frequency drift
Secondary oscillator using Timer1 @ 32 kHz
I'm supposed to get data from a ADC-ads7888 serially giving a serial clk of 25Mhz.
All i wanna know is if i can use a crystal of 40Mhz for the pic18f and
derive 25Mhz by programming(toggling a port with some delay corr to 25Mhz) for the ADC Sclk.
thanks in advance,
A
I'd appreciate more if any1 could help me comprehend the text in bold