PIC17C7XX Datasheet, PDF (306/328 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
FIGURE F-16: ADCON1 REGISTER (ADDRESS 15h, BANK 5)
R/W-0 R/W-0
ADCS1 ADCS0
bit7
R/W-0
ADFM
U-0 R/W-0 R/W-0 R/W-0 R/W-0
— PCFG3 PCFG2 PCFG1 PCFG0
bit0
bit 7-6:
ADCS1:ADCS0: A/D Conversion Clock Select bits
00 = FOSC/8
01 = FOSC/32
10 = FOSC/64
11 = FRC (clock derived from an internal RC oscillation)
bit 5:
ADFM: A/D Result format select
1 = Right justified. 6 Most Significant bits of ADRESH are read as ’0’.
0 = Left justified. 6 Least Significant bits of ADRESL are read as ’0’.
bit 4: Unimplemented: Read as '0'
bit 3-0: PCFG3:PCFG1: A/D Port Configuration Control bits
R = Readable bit
W = Writable bit
U = Unimplemented
bit, read as ‘0’
- n = Value at POR reset
PCFG3:PCFG1 AN15 AN14 AN13 AN12 AN11 AN10 AN9 AN8 AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0
000
A
A
A
A
A
A AAAAAAAAAA
001
D
A
A
A
A
A AADAAAAAAA
010
D
D
A
A
A
A AADDAAAAAA
011
D
D
D
A
A
A AADDDAAAAA
100
D
D
D
D
A
A AADDDDAAAA
101
D
D
D
D
D
A AADDDDDAAA
110
D
D
D
D
D
D AADDDDDDAA
111
D
D
D
D
D
D DDDDDDDDDD
A = Analog input
D = Digital I/O
bit 0:
PCFG0: A/D Voltage Reference Select bit
1 = A/D reference is the VREF+ and VREF- pins
0 = A/D reference is AVDD and AVSS
Note:When this bit is set, ensure that the A/D voltage reference specifications are met.
DS30289A-page 306
© 1998 Microchip Technology Inc.