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C8051F124-GQR Datasheet(PDF) 75 Page - Silicon Laboratories

Part # C8051F124-GQR
Description  Mixed Signal ISP Flash MCU Family
Download  350 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

C8051F124-GQR Datasheet(HTML) 75 Page - Silicon Laboratories

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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
Rev. 1.4
75
6.2.
ADC Modes of Operation
ADC0 has a maximum conversion speed of 100 ksps. The ADC0 conversion clock is derived from the sys-
tem clock divided by the value held in the ADCSC bits of register ADC0CF.
6.2.1. Starting a Conversion
A conversion can be initiated in one of four ways, depending on the programmed states of the ADC0 Start
of Conversion Mode bits (AD0CM1, AD0CM0) in ADC0CN. Conversions may be initiated by:
1.
Writing a ‘1’ to the AD0BUSY bit of ADC0CN;
2.
A Timer 3 overflow (i.e. timed continuous conversions);
3.
A rising edge detected on the external ADC convert start signal, CNVSTR0;
4.
A Timer 2 overflow (i.e. timed continuous conversions).
The AD0BUSY bit is set to logic 1 during conversion and restored to logic 0 when conversion is complete.
The falling edge of AD0BUSY triggers an interrupt (when enabled) and sets the AD0INT interrupt flag
(ADC0CN.5). Converted data is available in the ADC0 data word MSB and LSB registers, ADC0H, ADC0L.
Converted data can be either left or right justified in the ADC0H:ADC0L register pair (see example in
Figure 6.5) depending on the programmed state of the AD0LJST bit in the ADC0CN register.
When initiating conversions by writing a ‘1’ to AD0BUSY, the AD0INT bit should be polled to determine
when a conversion has completed (ADC0 interrupts may also be used). The recommended polling proce-
dure is shown below.
Step 1. Write a ‘0’ to AD0INT;
Step 2. Write a ‘1’ to AD0BUSY;
Step 3. Poll AD0INT for ‘1’;
Step 4. Process ADC0 data.
When CNVSTR0 is used as a conversion start source, it must be enabled in the crossbar, and the corre-
sponding pin must be set to open-drain, high-impedance mode (see Section “18. Port Input/Output” on
page 235
for more details on Port I/O configuration).


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