PIC16C745/P Microchip Technology, PIC16C745/P Datasheet - Page 89

• Manufacturer Part Number: PIC16C745/P
• Description: 8-Bit CMOS Microcontrollers with USB
• Manufacturer: Microchip Technology

12.0
The 8-bit Analog-To-Digital (A/D) converter module has
five inputs for the PIC16C745 and eight for the
PIC16C765.
The A/D allows conversion of an analog input signal to
a corresponding 8-bit digital value. The output of the
sample and hold is the input into the converter, which
generates the result via successive approximation. The
analog reference voltage is software selectable to
either the device’s positive supply voltage (V
voltage level on the RA3/AN3/V
REGISTER 12-1: A/D CONTROL REGISTER (ADCON0: 1Fh)
1999 Microchip Technology Inc.
bit7
bit 7-6: ADCS<1:0>: A/D Conversion Clock Select bits
bit 5-3: CHS<2:0>: Analog Channel Select bits
bit 2:
bit 1:
bit 0:
ADCS1 ADCS0
Note 1: A/D channels 5, 6 and 7 are implemented on the PIC16C765 only.
R/W-0
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
00 = F
01 = F
10 = F
11 = F
000 = channel 0, (RA0/AN0)
001 = channel 1, (RA1/AN1)
010 = channel 2, (RA2/AN2)
011 = channel 3, (RA3/AN3)
100 = channel 4, (RA5/AN4)
101 = channel 5, (RE0/AN5)
110 = channel 6, (RE1/AN6)
111 = channel 7, (RE2/AN7)
GO/DONE: A/D Conversion Status bit
If ADON = 1
1 = A/D conversion in progress (setting this bit starts the A/D conversion)
0 = A/D conversion not in progress (This bit is automatically cleared by hardware when the A/D conver-
sion is complete)
Unimplemented: Read as '0'
ADON: A/D On bit
1 = A/D converter module is operating
0 = A/D converter module is shutoff and consumes no operating current
R/W-0
RC
INT
INT
INT
/2
/8
/32
(clock derived from dedicated internal oscillator)
R/W-0
CHS2
REF
R/W-0
CHS1
pin.
(1)
(1)
(1)
Advanced Information
R/W-0
CHS0
DD
) or the
GO/DONE
R/W-0
The A/D converter has a unique feature of being able to
operate while the device is in SLEEP mode. To operate
in sleep, the A/D conversion clock must be derived from
the A/D’s dedicated internal RC oscillator.
The A/D module has three registers. These registers
are:
The ADCON0 register, shown in Register 12-1, con-
trols the operation of the A/D module. The ADCON1
register, shown in Register 12-2, configures the func-
tions of the port pins. The port pins can be configured
as analog inputs (RA3 can also be a voltage reference)
or as digital I/O.
Additional information on using the A/D module can be
found in the PICmicro™ Mid-Range MCU Family Ref-
erence Manual (DS33023) and in Application Note,
AN546.
• A/D Result Register (ADRES)
• A/D Control Register 0 (ADCON0)
• A/D Control Register 1 (ADCON1)
U-0
—
ADON
R/W-0
PIC16C745/765
bit0
R = Readable bit
W = Writable bit
U = Unimplemented bit,
- n = Value at POR reset
read as ‘0’
DS41124A-page 89