Microchip Technology dsPIC30F - Page 384

dsPIC30F Family Reference Manual
DS70064C-page 17-8 © 2004 Microchip Technology Inc.
Register 17-3: ADCON3: A/D Control Register 3
Upper Byte:
U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — —SAMC<4:0>
bit 15 bit 8
Lower Byte:
R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
ADRC
— ADCS<5:0>
bit 7 bit 0
bit 15-13 Unimplemented: Read as ‘0’
bit 12-8 SAMC<4:0>: Auto-Sample Time bits
11111 = 31 T
AD
·····
00001 = 1 T
AD
00000 = 0 TAD (only allowed if performing sequential conversions using more than one S/H amplifier)
bit 7 ADRC: A/D Conversion Clock Source bit
1 = A/D internal RC clock
0 = Clock derived from system clock
bit 6 Unimplemented: Read as ‘0’
bit 5-0 ADCS<5:0>: A/D Conversion Clock Select bits
111111 = T
CY/2 • (ADCS<5:0> + 1) = 32 • TCY
······
000001 = T
CY/2 • (ADCS<5:0> + 1) = TCY
000000 = TCY/2 • (ADCS<5:0> + 1) = TCY/2
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