C8051F960-B-GM Datasheet, PDF (294/492 Pages) Silicon Laboratories – Ultra Low Power 128K, LCD MCU Family

C8051F96x
SFR Definition 23.4. OSCXCN: External Oscillator Control
Bit
7
6
5
4
3
2
1
0
Name XCLKVLD
XOSCMD[2:0]
XFCN[2:0]
Type
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
SFR Page = 0x0; SFR Address = 0xB1
Bit
Name
Function
7 XCLKVLD External Oscillator Valid Flag.
Provides External Oscillator status and is valid at all times for all modes of operation
except External CMOS Clock Mode and External CMOS Clock Mode with divide by
2. In these modes, XCLKVLD always returns 0.
0: External Oscillator is unused or not yet stable.
1: External Oscillator is running and stable.
6:4 XOSCMD External Oscillator Mode Bits.
Configures the external oscillator circuit to the selected mode.
00x: External Oscillator circuit disabled.
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.
3 Reserved Read = 0b. Must Write 0b.
2:0 XFCN External Oscillator Frequency Control Bits.
Controls the external oscillator bias current.
000-111: See Table 23.1 on page 288 (Crystal Mode) or Table 23.2 on page 289 (RC
or C Mode) for recommended settings.
294
Rev. 1.0