C8051F2XX Datasheet, PDF (98/146 Pages) Silicon Laboratories – Mixed Signal 8 kB ISP Flash MCU Family

C8051F2xx
SFR Definition 13.1. OSCICN: Internal Oscillator Control
R/W
R/W
MSCLKE
-
Bit7
Bit6
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
-
IFRDY CLKSL IOSCEN IFCN1 IFCN0 00000100
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0 SFR Address:
0xB2
Bit7:
Bits6–5:
Bit4:
Bit3:
Bit2:
Bits1–0:
MSCLKE: Missing Clock Enable Bit
0: Missing Clock Detector Disabled
1: Missing Clock Detector Enabled; triggers a reset if a missing clock is detected
UNUSED. Read = 00b, Write = don't care
IFRDY: Internal Oscillator Frequency Ready Flag
0: Internal Oscillator Frequency not running at speed specified by the IFCN bits.
1: Internal Oscillator Frequency running at speed specified by the IFCN bits.
CLKSL: System Clock Source Select Bit
0: Uses Internal Oscillator as System Clock.
1: Uses External Oscillator as System Clock.
IOSCEN: Internal Oscillator Enable Bit
0: Internal Oscillator Disabled
1: Internal Oscillator Enabled
IFCN1-0: Internal Oscillator Frequency Control Bits
00: Internal Oscillator typical frequency is 2 MHz.
01: Internal Oscillator typical frequency is 4 MHz.
10: Internal Oscillator typical frequency is 8 MHz.
11: Internal Oscillator typical frequency is 16 MHz.
Table 13.1. Internal Oscillator Electrical Characteristics
–40 to +85 ×C unless otherwise specified.
Parameter
Conditions
Internal Oscillator Frequency
OSCICN.[1:0] = 00
OSCICN.[1:0] = 01
OSCICN.[1:0] = 10
OSCICN.[1:0] = 11
Internal Oscillator Current Consumption OSCICN.2 = 1
Internal Oscillator Temperature Stability
Internal Oscillator Power Supply (V_DD)
Stability
Min Typ Max Units
1.5
2.0
2.5
MHz
3.0
4.0
5.0
6.0
8.0
10
12
16
20
—
200
—
µA
—
4
— ppm/°C
—
6.4
—
%/V
98
Rev. 1.6