C8051F02X Datasheet, PDF (136/272 Pages) Silicon Laboratories – 8K ISP FLASH MCU Family

C8051F020/1/2/3
Figure 14.2. OSCICN: Internal Oscillator Control Register
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 00010100
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; reset triggered if clock is missing for more than 100 µs
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 14.1. Internal Oscillator Electrical Characteristics
VDD = 2.7V to 3.6V; T_a = -40°C to +85°C
PARAMETER
CONDITIONS
MIN TYP MAX
OSCICN.[1:0] = 00
1.5
2
2.4
Internal Oscillator Frequency
OSCICN.[1:0] = 01
OSCICN.[1:0] = 10
3.1
4
4.8
6.2
8
9.6
Internal Oscillator Current
Consumption (from VDD)
OSCICN.[1:0] = 11
OSCICN.2 = 1
12.3 16 19.2
200
UNITS
MHz
µA
136
Rev. 1.4