Dec 29, 2002 #1 D D1_DRE Member level 3 Joined Apr 26, 2002 Messages 61 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 518 Hello all Please I have the following questions about clocking timer0 or timer1 using an external clocking signal (i.e on pin T0KI or T1KI): 1. what is the maximum frequency supported, 2. Can I supply it with 5Mhz or 9Mhz xtal and it will work 2. The block diagram of the timer says no but will the frequency from the external clock source be divided by 4 also? Thanx
Hello all Please I have the following questions about clocking timer0 or timer1 using an external clocking signal (i.e on pin T0KI or T1KI): 1. what is the maximum frequency supported, 2. Can I supply it with 5Mhz or 9Mhz xtal and it will work 2. The block diagram of the timer says no but will the frequency from the external clock source be divided by 4 also? Thanx
Jan 14, 2003 #2 B bunalmis Full Member level 5 Joined Jan 3, 2003 Messages 281 Helped 19 Reputation 38 Reaction score 13 Trophy points 1,298 Location Turkey Activity points 2,208 1. what is the maximum frequency supported, Tcy = 4000/Fosc no prescaler; FTOCKImax = 1000 / (Tcy+40) Mhz with prescaler; FTOCKImax = 1000/ 20 = 50 Mhz Syncron mode FT1CKmax 33Mhz F series FT1CKmax 20Mhz LF series Asyncron mode FT1CKmax 16Mhz F series FT1CKmax 10Mhz LF series 2. Can I supply it with 5Mhz or 9Mhz xtal and it will work Which PIC ? 2. The block diagram of the timer says no but will the frequency from the external clock source be divided by 4 also? Look pic16f870.pdf.
1. what is the maximum frequency supported, Tcy = 4000/Fosc no prescaler; FTOCKImax = 1000 / (Tcy+40) Mhz with prescaler; FTOCKImax = 1000/ 20 = 50 Mhz Syncron mode FT1CKmax 33Mhz F series FT1CKmax 20Mhz LF series Asyncron mode FT1CKmax 16Mhz F series FT1CKmax 10Mhz LF series 2. Can I supply it with 5Mhz or 9Mhz xtal and it will work Which PIC ? 2. The block diagram of the timer says no but will the frequency from the external clock source be divided by 4 also? Look pic16f870.pdf.