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M451
May. 4, 2018
Page
939
of
1006
Rev.2.08
M4
51
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NICA
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A
L
Idle state
Sampling
A/D conversion
1 ADC clock
A/D conversion time
ADIFn
(EADC_STATUS2[n],
n=0~3)
A/D Converter
A/D Conversion Start
SWTRGn
(EADC_SWTRG[n],
n=0~18)
APB Bus Write
PCLK
End of conversion
First ADC clock
Analog input
sampling time
(X ADC clocks)
Synchronous to
ADC clock delay
up to 1 ADC clcok
A/D conversion start
delay time (Td)
Note: X = SMPTSEL (EADC_CTL[18:16]) + 1
Figure 6.22-12 Conversion Start Delay Timing Diagram
A/D Extend Sampling Time
6.22.5.8
When A/D operation at high ADC clock rate, the sampling time of analog input voltage may not
enough if the analog channel has heavy loading to cause fully charge time is longer. User can set
SMPTSEL (EADC_CTL[18:16]) to select the sampling cycle in ADC. User also can set extend
sampling time by writing EXTSMPT (EADC_SCTLn[31:24], n=0~15) for each sample module. The A/D
extend sampling time is present between A/D controller judge which channel to be converting and A/D
start to conversion. The range of extend sampling time is from 0 ~255 ADC clock. The extended
sampling time is shown below:
Содержание ARM Cortex NuMicro M451 Series
Страница 301: ...M451 May 4 2018 Page 301 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL...
Страница 324: ...M451 May 4 2018 Page 324 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL Figure 6 4 18 Checksum Calculation Flow...
Страница 355: ...M451 May 4 2018 Page 355 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 2 0 Reserved Reserved...
Страница 625: ...M451 May 4 2018 Page 625 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 00 5 bits 01 6 bits 10 7 bits 11 8 bits...
Страница 721: ...M451 May 4 2018 Page 721 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL the SCL line 1 0 Reserved Reserved...
Страница 1001: ...M451 May 4 2018 Page 1001 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 10x10x1 4 mm footprint 2 0 mm 9 2...
Страница 1002: ...M451 May 4 2018 Page 1002 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 7x7x1 4 mm footprint 2 0 mm 9 3...
Страница 1003: ...M451 May 4 2018 Page 1003 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 48L 7x7x1 4mm footprint 2 0mm 9 4...