PIC18F2221_1 Datasheet, PDF (234/402 Pages) Microchip Technology – Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2221/2321/4221/4321 FAMILY
REGISTER 20-2:
ADCON1: A/D CONTROL REGISTER 1
U-0
U-0
R/W-0 R/W-0
—
—
VCFG1 VCFG0
bit 7
R/W-0⁽¹⁾
PCFG3
R/W⁽¹⁾
PCFG2
R/W⁽¹⁾
PCFG1
R/W⁽¹⁾
PCFG0
bit 0
bit 7-6
bit 5
bit 4
bit 3-0
Unimplemented: Read as ‘0’
VCFG1: Voltage Reference Configuration bit (VREF- source)
1 = VREF- (AN2)
0 = VSS
VCFG0: Voltage Reference Configuration bit (VREF+ source)
1 = VREF+ (AN3)
0 = VDD
PCFG<3:0>: A/D Port Configuration Control bits
PCFG<3:0>
0000⁽¹⁾
0001
0010
0011
0100
0101
0110
0111⁽¹⁾
1000
1001
1010
1011
1100
1101
1110
1111
A A A A A A A A A A AAA
A A A A A A A A A A AAA
A A A A A A A A A A AAA
D A A A A A A A A A AAA
D D A A A A A A A A AAA
D D D A A A A A A A AAA
D D D D A A A A A A AAA
D D D D D A A A A A AAA
D D D D D D A A A A AAA
D D D D D D D A A A AAA
D D D D D D D D A A AAA
D D D D D D D D D A AAA
D D D D D D D D D DAAA
D D D D D D D D D DDAA
D D D D D D D D D DDDA
D D D D D D D D D D DDD
A = Analog input
D = Digital I/O
Note 1: The POR value of the PCFG bits depends on the value of the PBADEN Con-
figuration bit. When PBADEN = 1, PCFG<3:0> = 0000; when PBADEN = 0,
PCFG<3:0> = 0111.
2: AN5 through AN7 are available only on 40/44-pin devices.
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
DS39689F-page 234
© 2009 Microchip Technology Inc.