C8051F349-GMR Silicon Labs, C8051F349-GMR Datasheet - Page 137
![no-image](/images/no-image-200.jpg)
C8051F349-GMR
Manufacturer Part Number
C8051F349-GMR
Description
8-bit Microcontrollers - MCU 25 MIPS 32KB USB MCU
Manufacturer
Silicon Labs
Datasheet
1.C8051F349-GMR.pdf
(276 pages)
Specifications of C8051F349-GMR
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
- Current page: 137 of 276
- Download datasheet (2Mb)
Bit7:
Bits6–4: XOSCMD2–0: External Oscillator Mode Bits.
Bit3:
Bits2–0: XFCN2–0: External Oscillator Frequency Control Bits.
CRYSTAL MODE (Circuit from Figure 14.1, Option 1; XOSCMD = 11x)
RC MODE (Circuit from Figure 14.1, Option 2; XOSCMD = 10x)
C MODE (Circuit from Figure 14.1, Option 3; XOSCMD = 10x)
XTLVLD XOSCMD2 XOSCMD1 XOSCMD0
Bit7
R
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.
00x: External Oscillator circuit off.
010: External CMOS Clock Mode.
011: External CMOS Clock Mode with divide by 2 stage.
100: RC Oscillator Mode.
101: Capacitor Oscillator Mode.
110: Crystal Oscillator Mode.
111: Crystal Oscillator Mode with divide by 2 stage.
RESERVED. Read = 0, Write = don't care.
000-111: See table below:
Choose XFCN value to match crystal or resonator frequency.
Choose XFCN value to match frequency range:
f = 1.23(10
f = frequency of clock in MHz
C = capacitor value in pF
R = Pull-up resistor value in k
Choose K Factor (KF) for the oscillation frequency desired:
f = KF / (C x V
f = frequency of clock in MHz
C = capacitor value the XTAL2 pin in pF
V
XFCN Crystal (XOSCMD = 11x) RC (XOSCMD = 10x)
DD
000
001
010
100
101
011
110
111
SFR Definition 14.4. OSCXCN: External Oscillator Control
= Power Supply on MCU in volts
R/W
Bit6
590 kHz f 1.5 MHz
225 kHz f 590 kHz
10 MHz f 30 MHz
3
84 kHz f 225 kHz
1.5 MHz f 4 MHz
4 MHz f 10 MHz
) / (R x C) , where
32 kHz f 84kHz
DD
R/W
f 32 kHz
Bit5
) , where
C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
R/W
Bit4
1.6 MHz f 3.2 MHz
100 kHz f 200 kHz
200 kHz f 400 kHz
400 kHz f 800 kHz
800 kHz f 1.6 MHz
50 kHz f 100 kHz
Rev. 1.3
25 kHz f 50 kHz
Bit3
R
-
f 25 kHz
XFCN2
R/W
Bit2
XFCN1
C (XOSCMD = 10x)
R/W
Bit1
K Factor = 1590
K Factor = 0.87
K Factor = 180
K Factor = 664
K Factor = 2.6
K Factor = 7.7
K Factor = 22
K Factor = 65
XFCN0
R/W
Bit0
SFR Address:
00000000
Reset Value
0xB1
137
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