PIC16F877-20/P Microchip Technology, PIC16F877-20/P Datasheet - Page 404

• Manufacturer Part Number: PIC16F877-20/P
• Description: IC MCU FLASH 8KX14 EE 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877-20/P

• Core Size: 8-Bit
• Program Memory Size: 14KB (8K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC16F
• No. Of I/o's: 33
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 368Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
22.1
DS31022A-page 22-2
Introduction
Basic 8-bit
Converter
A/D
This Analog-to-Digital (A/D) converter module has four analog inputs.
The A/D allows conversion of an analog input signal to a corresponding 8-bit digital number. The
output of the sample and hold is the input into the converter, which generates the result via suc-
cessive approximation. The analog reference voltage is software selectable to either the device’s
positive supply voltage (V
unique feature of being able to operate while the device is in SLEEP mode.
The A/D module has three registers. These registers are:
The ADCON0 register, shown in
ADCON1 register, shown in
can be configured as analog inputs (or a voltage reference) or as digital I/O.
Figure 22-1:
• A/D Result Register (ADRES)
• A/D Control Register0 (ADCON0)
• A/D Control Register1 (ADCON1)
(Reference
voltage)
V
REF
Basic 8-bit A/D Block Diagram
(Input voltage)
PCFG1:PCFG0
V
AIN
DD
) or the voltage level on the AN3/V
Figure
V
Figure 22-1
22-2, configures the functions of the port pins. The port pins
DD
00 or
10 or
11
01
controls the operation of the A/D module. The
CHS1:CHS0
11
10
01
00
REF
pin. The A/D converter has a
1997 Microchip Technology Inc.
AN1
AN2
AN0
AN3/V
REF