C8051F709-GQR Silicon Labs, C8051F709-GQR Datasheet - Page 176

• Manufacturer Part Number: C8051F709-GQR
• Description: 8-bit Microcontrollers - MCU 8kB 32B EEPROM Cap Sense
• Manufacturer: Silicon Labs

Specifications of C8051F709-GQR

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

C8051F70x/71x
SFR Definition 27.4. OSCXCN: External Oscillator Control
SFR Address = 0xB5; SFR Page = F
176
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 = 0; Write = Don’t Care
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
100
101
110
011
111
6
0
XOSCMD[2:0]
590 kHz  f 1.5 MHz
225 kHz  f 590 kHz
10 MHz  f 30 MHz
84 kHz  f 225 kHz
1.5 MHz  f 4 MHz
4 MHz  f 10 MHz
32 kHz f 84 kHz
Crystal Mode
R/W
5
0
f  32 kHz
Rev. 1.0
4
0
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
25 kHz f 50 kHz
Function
R
3
0
f 25 kHz
RC Mode
2
0
XFCN[2:0]
K Factor = 1590
K Factor = 0.87
R/W
K Factor = 180
K Factor = 664
K Factor = 2.6
K Factor = 7.7
K Factor = 22
K Factor = 65
1
0
C Mode
0
0