C8051F997-GUR Silicon Labs, C8051F997-GUR Datasheet - Page 193

• 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

SFR Definition 19.3. OSCICL: Internal Oscillator Calibration
SFR Page = 0x0; SFR Address = 0xB3
Note: If the Precision Internal Oscillator is selected as the system clock, the following procedure should be used
Name
Reset
Type
6:0
Bit
Bit
7
when changing the value of the internal oscillator calibration bits. 
1. Switch to a different clock source. 
2. Disable the oscillator by writing OSCICN.7 to 0. 
3. Change OSCICL to the desired setting. 
4. Enable the oscillator by writing OSCICN.7 to 1.
OSCICL
Name
SSE
SSE
R/W
7
0
Spread Spectrum Enable.
0: Spread Spectrum clock dithering disabled.
1: Spread Spectrum clock dithering enabled.
Internal Oscillator Calibration.
Factory calibrated to obtain a frequency of 24.5 MHz. Incrementing this register
decreases the oscillator frequency and decrementing this register increases the
oscillator frequency. The step size is approximately 1% of the calibrated frequency.
The recommended calibration frequency range is between 16 and 24.5 MHz.
Varies
R
6
Varies
R/W
5
Varies
R/W
Rev. 1.1
4
OSCICL
C8051F99x-C8051F98x
Function
Varies
R/W
3
[6:0]
Varies
R/W
2
Varies
R/W
1
Varies
R/W
0
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