C8051F997-GUR Silicon Labs, C8051F997-GUR Datasheet - Page 194

• Manufacturer Part Number: C8051F997-GUR
• Description: 8-bit Microcontrollers - MCU 8kB 14-CH CDC
• Manufacturer: Silicon Labs

Specifications of C8051F997-GUR

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

C8051F99x-C8051F98x
SFR Definition 19.4. OSCXCN: External Oscillator Control
SFR Page = 0x0; SFR Address = 0xB1
194
Name XCLKVLD
Reset
Type
6:4
2:0
Bit
Bit
7
3
XCLKVLD External Oscillator Valid Flag.
XOSCMD External Oscillator Mode Bits.
Reserved Read = 0b. Must Write 0b.
XFCN
Name
R
7
0
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.
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.
External Oscillator Frequency Control Bits.
Controls the external oscillator bias current.
000-111: See Table 19.1 on page 188 (Crystal Mode) or Table 19.2 on page 189 (RC
or C Mode) for recommended settings.
R
6
0
XOSCMD[2:0]
R/W
5
0
R/W
Rev. 1.1
4
0
Reserved
Function
R/W
3
0
R/W
2
0
XFCN[2:0]
R/W
1
0
R/W
0
0