Datasheet

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304
DS70283K-page 206 © 2007-2012 Microchip Technology Inc.
REGISTER 20-3: AD1CON3: ADC1 CONTROL REGISTER 3
R/W-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
ADRC
— — SAMC<4:0>
(1)
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
ADCS<7:0>
(2)
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: ADC Conversion Clock Source bit
1 = ADC internal RC clock
0 = Clock derived from system clock
bit 14-13 Unimplemented: Read as ‘0’
bit 12-8 SAMC<4:0>: Auto Sample Time bits
(1)
11111 = 31 TAD
•
•
•
00001 = 1 T
AD
00000 = 0 TAD
bit 7-0 ADCS<7:0>: ADC Conversion Clock Select bits
(2)
11111111 = Reserved
•
•
•
•
01000000 = Reserved
00111111 = T
CY · (ADCS<7:0> + 1) = 64 · TCY = TAD
•
•
•
00000010 = T
CY · (ADCS<7:0> + 1) = 3 · TCY = TAD
00000001 = T
CY · (ADCS<7:0> + 1) = 2 · TCY = TAD
00000000 = TCY · (ADCS<7:0> + 1) = 1 · TCY = TAD
Note 1: This bit only used if AD1CON1<7:5> (SSRC2:0) = 111.
2: This bit is not used if AD1CON3<15> (ADRC) = 1.