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DVR 数据表(PDF) 297 Page - Microchip Technology

部件名 DVR
功能描述  16-Bit General Purpose Microcontrollers with 256-Kbyte Flash and 16-Kbyte RAM in Low Pin Count Packages
PDF  416 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

DVR 数据表(HTML) 297 Page - Microchip Technology

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 2016-2018 Microchip Technology Inc.
DS30010118D-page 297
PIC24FJ256GA705 FAMILY
REGISTER 24-3:
AD1CON3: A/D CONTROL REGISTER 3
R/W-0
R-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADRC(1)
EXTSAM
PUMPEN(2)
SAMC4
SAMC3
SAMC2
SAMC1
SAMC0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADCS7
ADCS6
ADCS5
ADCS4
ADCS3
ADCS2
ADCS1
ADCS0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
ADRC: A/D Conversion Clock Source bit(1)
1 = Dedicated ADC RC clock generator (4 MHz nominal).
0 = Clock derived from system clock
bit 14
EXTSAM: Extended Sampling Time bit
1 = A/D is still sampling after SAMP = 0
0 = A/D is finished sampling
bit 13
PUMPEN: Charge Pump Enable bit(2)
1 = Charge pump for switches is enabled
0 = Charge pump for switches is disabled
bit 12-8
SAMC<4:0>: Auto-Sample Time Select bits
11111 = 31 TAD
•
•
•
00001 = 1 TAD
00000 = 0 TAD
bit 7-0
ADCS<7:0>: A/D Conversion Clock Select bits
11111111 = 256 • TCY = TAD
•
•
•
00000001 = 2 • TCY = TAD
00000000 = TCY =TAD
Note 1:
Selecting the internal ADC RC clock requires that ADCSx be one or greater. Setting ADCSx = 0 when
ADRC = 1 will violate the TAD (min) specification.
2:
The user should enable the charge pump if AVDD is < 2.7 V. Longer sample times are required due to the
increase of the internal resistance of the MUX if the charge pump is disabled.



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