PIC17C75X Datasheet, PDF (288/320 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers

PIC17C75X
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 AN11 AN10 AN9 AN8
000
A
A AA
001
A
A AA
010
A
A AA
011
A
A AA
100
A
A AA
101
D
A AA
110
D
D AA
111
D
D DD
A = Analog input
D = Digital I/O
AN7
A
D
D
D
D
D
D
D
AN6 AN5
AA
AA
DA
DD
DD
DD
DD
DD
AN4
A
A
A
A
D
D
D
D
AN3 AN2 AN1 AN0
A AAA
A AAA
A AAA
A AAA
A AAA
D AA A
D DA A
D DDD
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.
DS30264A-page 288
Preliminary
© 1997 Microchip Technology Inc.