參數(shù)資料
型號： C8051F2XX
廠商： Electronic Theatre Controls, Inc.
英文描述： Mixed Signal 8 kB ISP Flash MCU Family
中文描述： 混合信號8 KB的閃存MCU系列的ISP
文件頁數(shù)： 41/146頁
文件大?。?/td> 1856K
代理商： C8051F2XX
C8051F2xx
Rev. 1.6
41
6.2.
ADC Modes of Operation
The ADC has a maximum conversion speed of 100 ksps. The ADC conversion clock is derived from the
system clock. The ADC conversion clock is derived from a divided version of SYSCLK. Divide ratios of 1,
2, 4, 8, or 16 are supported by setting the ADCSC bits in the ADC0CF Register. This is useful to adjust
conversion speed to accommodate different system clock speeds.
A conversion can be initiated in one of two ways, depending on the programmed states of the ADC Start of
Conversion Mode bits (ADSTM1, ADSTM0) in ADC0CN. Conversions may be initiated by:
1.
2.
Writing a 1 to the ADBUSY bit of ADC0CN;
A Timer 2 overflow (i.e. timed continuous conversions).
Writing a 1 to ADBUSY provides software control of the ADC whereby conversions are performed "on-
demand". During conversion, the ADBUSY bit is set to 1 and restored to 0 when conversion is complete.
The falling edge of ADBUSY triggers an interrupt (when enabled) and sets the ADCINT interrupt flag in the
ADC0CN register. Note: When conversions are performed "on-demand", the ADCINT flag, not ADBUSY,
should be polled to determine when the conversion has completed. Converted data is available in the ADC
data word register, ADC0H.
The ADCTM bit in register ADC0CN controls the ADC track-and-hold mode. In its default state, the ADC
input is continuously tracked, except when a conversion is in progress. Setting ADCTM to 1 allows one of
two different low power track-and-hold modes to be specified by states of the ADSTM1-0 bits (also in
ADC0CN):
1.
2.
Tracking begins with a write of 1 to ADBUSY and lasts for 3 SAR clocks;
Tracking starts with an overflow of Timer 2 and lasts for 3 SAR clocks.
Tracking can be disabled (shutdown) when the entire chip is in low power standby or sleep modes.
Figure 6.2. 12-Bit ADC Track and Conversion Example Timing
1
2
3
4
5
6
7
8
9
10 11
12 13 14 15
16
CNVSTR
(ADSTM[1:0]=10)
ADCTM=1
Track
Convert
Low Power Mode
ADCTM=0
Track Or Convert
Convert
Track
Low Power or
Convert
Timer2, Timer3 Overflow;
Write 1 to ADBUSY
(ADSTM[1:0]=00, 01, 11)
ADCTM=1
Track
Convert
Low Power Mode
ADCTM=0
Track or Convert
Convert
Track
Low Power or
Convert
A. ADC Timing for External Trigger Source
B. ADC Timing for Internal Trigger Sources
SAR Clocks
SAR Clocks
1
2
3
4
5
6
7
8
9
10 11 12
13 14 15
16 17 18 19
1
2
3
4
5
6
7
8
9
10 11 12
13 14 15
16
SAR Clocks
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