C8051F581-IMR Silicon Labs, C8051F581-IMR Datasheet - Page 182

• Manufacturer Part Number: C8051F581-IMR
• Description: 8-bit Microcontrollers - MCU 50MIPS 128kB 8kB SPI
• Manufacturer: Silicon Labs

Specifications of C8051F581-IMR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

C8051F58x/F59x
SFR Definition 19.6. OSCXCN: External Oscillator Control
SFR Address = 0x9F; SFR Page = 0x0F;
182
Name
Reset
6:4
2:0
Bit
Type
7
3
Bit
XOSCMD[2:0] External Oscillator Mode Select.
XFCN[2:0]
XTLVLD
XTLVLD
Unused
Name
R
7
0
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.
Read = 0b; Write =0b
External Oscillator Frequency Control Bits.
Set according to the desired frequency for Crystal or RC mode.
Set according to the desired K Factor for C mode.
XFCN
000
001
010
011
100
101
110
111
6
0
XOSCMD[2:0]
Crystal Mode
f  32 kHz
32 kHz f 84 kHz
84 kHz  f 225 kHz
225 kHz  f 590 kHz
590 kHz  f 1.5 MHz 200 kHz f 400 kHz
1.5 MHz  f 4 MHz
4 MHz  f 10 MHz
10 MHz  f 30 MHz
R/W
5
0
Rev. 1.2
4
0
RC Mode
f 25 kHz
25 kHz f 50 kHz
50 kHz f 100 kHz
100 kHz f 200 kHz
400 kHz f 800 kHz
800 kHz f 1.6 MHz
1.6 MHz f 3.2 MHz
Function
R
3
0
2
0
C Mode
K Factor = 0.87
K Factor = 2.6
K Factor = 7.7
K Factor = 22
K Factor = 65
K Factor = 180
K Factor = 664
K Factor = 1590
XFCN[2:0]
R/W
1
0
0
0