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參數(shù)資料
| 型號： | R5F212ACSDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQFP48 |
| 封裝： | 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 57/138頁 |
| 文件大小： | 492K |
| 代理商： | R5F212ACSDFP |
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237
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
Figure 21-2. ADC Auto Trigger Logic
Using the ADC Interrupt Flag as a trigger source makes the ADC start a new conversion as soon
as the ongoing conversion has finished. The ADC then operates in Free Running mode, con-
stantly sampling and updating the ADC Data Register. The first conversion must be started by
writing a logical one to the ADSC bit in ADCSRA. In this mode the ADC will perform successive
conversions independently of whether the ADC Interrupt Flag, ADIF is cleared or not. The free
running mode is not allowed on the amplified channels.
If Auto Triggering is enabled, single conversions can be started by writing ADSC in ADCSRA to
one. ADSC can also be used to determine if a conversion is in progress. The ADSC bit will be
read as one during a conversion, independently of how the conversion was started.
21.4
Prescaling and Conversion Timing
Figure 21-3. ADC Prescaler
By default, the successive approximation circuitry requires an input clock frequency between 50
kHz and 2 MHz to get maximum resolution. If a lower resolution than 10 bits is needed, the input
clock frequency to the ADC can be higher than 2 MHz to get a higher sample rate.
The ADC module contains a prescaler, which generates an acceptable ADC clock frequency
from any CPU frequency above 100 kHz. The prescaling is set by the ADPS bits in ADCSRA.
The prescaler starts counting from the moment the ADC is switched on by setting the ADEN bit
in ADCSRA. The prescaler keeps running for as long as the ADEN bit is set, and is continuously
reset when ADEN is low.
ADSC
ADIF
SOURCE 1
SOURCE n
ADTS[2:0]
CONVERSION
LOGIC
PRESCALER
START
CLK
ADC
.
EDGE
DETECTOR
ADATE
7-BIT ADC PRESCALER
ADC CLOCK SOURCE
CK
ADPS0
ADPS1
ADPS2
CK/128
CK/2
CK/4
CK/8
CK/16
CK/32
CK/64
Reset
ADEN
START
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| R5F212ACSDFP#U0 | 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT R8C2A 64LQFP |
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| R5F212ACSDXXXFA | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU R8C FAMILY / R8C/2x SERIES |
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| R5F212ACSNFA | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:MCU |
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