PIC17C752-08/CL MICROCHIP [Microchip Technology], PIC17C752-08/CL Datasheet - Page 177

• Manufacturer Part Number: PIC17C752-08/CL
• Description: High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

16.0
The analog-to-digital (A/D) converter module has
twelve analog inputs for the PIC17C75X devices and
sixteen for the PIC17C76X devices.
The analog input charges a sample and hold capacitor.
The output of the sample and hold capacitor is the input
into the converter. The converter then generates a dig-
ital result of this analog level via successive approxima-
tion. This A/D conversion, of the analog input signal,
results in a corresponding 10-bit digital number.
The analog reference voltages (positive and negative
supply) are software selectable to either the device’s
supply voltages (AV
the RG3/AN0/V
FIGURE 16-1: ADCON0 REGISTER (ADDRESS: 14h, BANK 5)
1998 Microchip Technology Inc.
bit7
bit 7-4: CHS3:CHS0: Analog Channel Select bits
bit 3:
bit 2:
bit 1:
bit 0:
R/W-0
CHS3
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
0000 = channel 0, (AN0)
0001 = channel 1, (AN1)
0010 = channel 2, (AN2)
0011 = channel 3, (AN3)
0100 = channel 4, (AN4)
0101 = channel 5, (AN5)
0110 = channel 6, (AN6)
0111 = channel 7, (AN7)
1000 = channel 8, (AN8)
1001 = channel 9, (AN9)
1010 = channel 10, (AN10)
1011 = channel 11, (AN11)
1100 = channel 12, (AN12) (PIC17C76X only)
1101 = channel 13, (AN13) (PIC17C76X only)
1110 = channel 14, (AN14) (PIC17C76X only)
1111 = channel 15, (AN15) (PIC17C76X only)
11xx = RESERVED, do not select (PIC17C75X only)
Unimplemented: Read as '0'
GO/DONE: A/D Conversion Status bit
If ADON = 1
1 = A/D conversion in progress (setting this bit starts the A/D conversion which is automatically cleared
0 = A/D conversion not in progress
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
CHS2
REF
by hardware when the A/D conversion is complete)
+ and RG2/AN1/V
DD
R/W-0
, AVss) or the voltage level on
CHS1
R/W-0
CHS0
REF
- pins.
U-0
—
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 oper-
ate in sleep, the A/D clock must be derived from the
A/D’s internal RC oscillator.
The A/D module has four registers. These registers
are:
The ADCON0 register, shown in
the operation of the A/D module. The ADCON1 regis-
ter, shown in
the port pins. The port pins can be configured as ana-
log inputs (RG3 and RG2 can also be the voltage refer-
ences) or as digital I/O.
• A/D Result High Register (ADRESH)
• A/D Result Low Register (ADRESL)
• A/D Control Register0 (ADCON0)
• A/D Control Register1 (ADCON1)
U-0
—
Figure
ADON
R/W-0
bit0
16-2, configures the functions of
PIC17C7XX
R = Readable bit
W = Writable bit
U = Unimplemented bit,
- n = Value at POR reset
read as ‘0’
Figure
DS30289A-page 177
16-1, controls