C8051F850-C-GM Datasheet, PDF (138/328 Pages) Silicon Laboratories – Low-Cost 8-bit MCU Family with up to 8 kB of Flash

16.6. Low Frequency Oscillator Control Registers
Register 16.2. OSCLCN: Low Frequency Oscillator Control
Bit
7
6
5
4
3
2
1
0
Name OSCLEN OSCLRDY
OSCLF
OSCLD
Type
RW
R
RW
RW
Reset
0
0
X
X
X
X
0
0
SFR Address: 0xB1
Table 16.2. OSCLCN Register Bit Descriptions
Bit
Name
Function
7
OSCLEN Internal L-F Oscillator Enable.
This bit enables the internal low-frequency oscillator. Note that the low-frequency oscilla-
tor is automatically enabled when the watchdog timer is active.
0: Internal L-F Oscillator Disabled.
1: Internal L-F Oscillator Enabled.
6
OSCLRDY Internal L-F Oscillator Ready.
0: Internal L-F Oscillator frequency not stabilized.
1: Internal L-F Oscillator frequency stabilized.
5:2
OSCLF Internal L-F Oscillator Frequency Control Bits.
Fine-tune control bits for the Internal L-F oscillator frequency. When set to 0000b, the L-F
oscillator operates at its fastest setting. When set to 1111b, the L-F oscillator operates at
its slowest setting. The OSCLF bits should only be changed by firmware when the L-F
oscillator is disabled (OSCLEN = 0).
1:0
OSCLD Internal L-F Oscillator Divider Select.
00: Divide by 8 selected.
01: Divide by 4 selected.
10: Divide by 2 selected.
11: Divide by 1 selected.
Note: OSCLRDY is only set back to 0 in the event of a device reset or a change to the OSCLD bits.
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Rev. 1.0