PIC16F737-I Datasheet, PDF (153/276 Pages) Microchip Technology – 28/40/44-Pin, 8-Bit CMOS Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

12.0 ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
The Analog-to-Digital (A/D) Converter module has
11 inputs for the PIC16F737 and PIC16F767 devices
and 14 for the PIC16F747 AND PIC16F777 devices.
The A/D converter allows conversion of an analog input
signal to a corresponding 10-bit digital number.
A new feature for the A/D converter is the addition of
programmable acquisition time. This feature allows the
user to select a new channel for conversion and to set
the GO/DONE bit immediately. When the GO/DONE bit
is set, the selected channel is sampled for the
programmed acquisition time before a conversion is
actually started. This removes the firmware overhead
required to allow for an acquisition (sampling) period
(see Register 12-3 and Section 12.2 “Selecting and
Configuring Automatic Acquisition Time”).
PIC16F7X7
The module has five registers:
• A/D Result High Register (ADRESH)
• A/D Result Low Register (ADRESL)
• A/D Control Register 0 (ADCON0)
• A/D Control Register 1 (ADCON1)
• A/D Control Register 2 (ADCON2)
The ADCON0 register, shown in Register 12-1, controls
the operation of the A/D module and clock source. The
ADCON1 register, shown in Register 12-2, configures
the functions of the port pins, justification and voltage
reference sources. The ADCON2, shown in
Register 12-3, configures the programmed acquisition
time.
Additional information on using the A/D module can be
found in the “PICmicro^® Mid-Range MCU Family
Reference Manual” (DS33023) and in Application Note
AN546 “Using the Analog-to-Digital (A/D) Converter”
(DS00546).
 2004 Microchip Technology Inc.
DS30498C-page 151