Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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C8051F120/1/2/3 C8051F124/5/6/7 Preliminary Figure 14.4. CLKSEL: System Clock Selection Register R/W R/W R/W R/W R/W R/W R/W R/W Reset Value - - CLKDIV1 CLKDIV0 - - CLKSL1 CLKSL0 00000000 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address: 0x97 SFR Page: F Bits 7-6: Bits 5-4: Bits 3-2: Bits 1-0: Reserved. CLKDIV1-0: Output SYSCLK Divide Factor. These bits can be used to pre-divide SYSCLK before it is output to a port pin through the crossbar. 00:OutputwillbeSYSCLK. 01:OutputwillbeSYSCLK/2. 10:OutputwillbeSYSCLK/4. 11:OutputwillbeSYSCLK/8. See Section “18. PORT INPUT/OUTPUT” on page 203 for more details about routing this output to a port pin. Reserved. CLKSL1-0: System Clock Source Select Bits. 00: SYSCLK derived from the Internal Oscillator, and scaled as per the IFCN bits in OSCICN. 01: SYSCLK derived from the External Oscillator circuit. 10: SYSCLK derived from the PLL. 11: Reserved. Page 164 DS008-0.8-AUG02 © 2002 Cygnal Integrated Products, Inc.
Preliminary C8051F120/1/2/3 C8051F124/5/6/7 Figure 14.5. OSCXCN: External Oscillator Control Register R R/W R/W R/W R R/W R/W R/W Reset Value XTLVLD XOSCMD2 XOSCMD1 XOSCMD0 - XFCN2 XFCN1 XFCN0 00000000 Bit7: Bits6-4: Bit3: Bits2-0: Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address: 0x8C SFR Page: F XTLVLD: Crystal Oscillator Valid Flag. (Valid only when XOSCMD = 11x.) 0: Crystal Oscillator is unused or not yet stable. 1: Crystal Oscillator is running and stable. XOSCMD2-0: External Oscillator Mode Bits. 00x: External Oscillator circuit off. 010: External CMOS Clock Mode (External CMOS Clock input on XTAL1 pin). 011: External CMOS Clock Mode with divide by 2 stage (External CMOS Clock input on XTAL1 pin). 10x: RC/C Oscillator Mode with divide by 2 stage. 110: Crystal Oscillator Mode. 111: Crystal Oscillator Mode with divide by 2 stage. RESERVED. Read = 0, Write = don't care. XFCN2-0: External Oscillator Frequency Control Bits. 000-111: see table below: XFCN Crystal (XOSCMD = 11x) RC (XOSCMD = 10x) C (XOSCMD = 10x) 000 f ≤ 32kHz f ≤ 25kHz K Factor = 0.87 001 32kHz < f ≤ 84kHz 25kHz < f ≤ 50kHz K Factor = 2.6 010 84kHz < f ≤ 225kHz 50kHz < f ≤ 100kHz K Factor = 7.7 011 225kHz < f ≤ 590kHz 100kHz < f ≤ 200kHz K Factor = 22 100 590kHz < f ≤ 1.5MHz 200kHz < f ≤ 400kHz K Factor = 65 101 1.5MHz < f ≤ 4MHz 400kHz < f ≤ 800kHz K Factor = 180 110 4MHz < f ≤ 10MHz 800kHz < f ≤ 1.6MHz K Factor = 664 111 10MHz < f ≤ 30MHz 1.6MHz < f ≤ 3.2MHz K Factor = 1590 CRYSTAL MODE (Circuit from Figure 14.1, Option 1; XOSCMD = 11x) Choose XFCN value to match crystal frequency. RC MODE (Circuit from Figure 14.1, Option 2; XOSCMD = 10x) Choose XFCN value to match frequency range: f=1.23(10 3 )/(R*C),where f = frequency of oscillation in MHz C = capacitor value in pF R = Pull-up resistor value in kΩ CMODE(Circuit from Figure 14.1, Option 3; XOSCMD = 10x) Choose K Factor (KF) for the oscillation frequency desired: f = KF / (C * VDD), where f = frequency of oscillation in MHz C = capacitor value on XTAL1, XTAL2 pins in pF © 2002 Cygnal Integrated Products, Inc. DS008-0.8-AUG02 Page 165
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Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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