參數(shù)資料
型號： TOOLSTICK300DC
廠商： Silicon Laboratories Inc
文件頁數(shù)： 3/178頁
文件大小： 0K
描述： TOOLSTICK DAUGHTER CARD
標準包裝： 1
系列： ToolStick
類型： MCU
適用于相關產(chǎn)品： C8051F300
所含物品： 子卡
C8051F300/1/2/3/4/5
100
Rev. 2.9
SFR Definition 11.3. OSCXCN: External Oscillator Control
Bit7:
XTLVLD: Crystal Oscillator Valid Flag.
(Read only when XOSCMD = 11x.)
0: Crystal Oscillator is unused or not yet stable.
1: Crystal Oscillator is running and stable.
Bits6–4: XOSCMD2-0: External Oscillator Mode Bits.
00x: External Oscillator circuit off.
010: External CMOS Clock Mode.
011: External CMOS Clock Mode with divide by 2 stage.
100: RC Oscillator Mode with divide by 2 stage.
101: Capacitor Oscillator Mode with divide by 2 stage.
110: Crystal Oscillator Mode.
111: Crystal Oscillator Mode with divide by 2 stage.
Bit3:
RESERVED. Read = 0, Write = don't care.
Bits2–0: XFCN2-0: External Oscillator Frequency Control Bits.
000-111: See table below:
CRYSTAL MODE (Circuit from Figure 11.1, Option 1; XOSCMD = 11x)
Choose XFCN value to match crystal frequency.
RC MODE (Circuit from Figure 11.1, Option 2; XOSCMD = 10x)
Choose XFCN value to match frequency range:
f = 1.23(103) / (R x C), where
f = frequency of oscillation in MHz
C = capacitor value in pF
R = Pull-up resistor value in k
C MODE (Circuit from Figure 11.1, Option 3; XOSCMD = 10x)
Choose K Factor (KF) for the oscillation frequency desired:
f = KF / (C x VDD), where
f = frequency of oscillation in MHz
C = capacitor value the XTAL2 pin in pF
VDD = Power Supply on MCU in volts
R
R/W
R
R/W
Reset Value
XTLVLD XOSCMD2 XOSCMD1 XOSCMD0
—
XFCN2
XFCN1
XFCN0
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0xB1
XFCN
Crystal (XOSCMD = 11x)
RC (XOSCMD = 10x)
C (XOSCMD = 10x)
000
f
32 kHz
f
25 kHz
K Factor = 0.87
001
32 kHz
f 84 kHz
25 kHz
f 50 kHz
K Factor = 2.6
010
84 kHz
f 225 kHz
50 kHz
f 100 kHz
K Factor = 7.7
011
225 kHz
f 590 kHz
100 kHz
f 200 kHz
K Factor = 22
100
590 kHz
f 1.5 MHz
200 kHz
f 400 kHz
K Factor = 65
101
1.5 MHz
f 4 MHz
400 kHz
f 800 kHz
K Factor = 180
110
4 MHz
f 10 MHz
800 kHz
f 1.6 MHz
K Factor = 664
111
10 MHz
f 30 MHz
1.6 MHz
f 3.2 MHz
K Factor = 1590
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