PIC16LC74B-04/L Microchip Technology, PIC16LC74B-04/L Datasheet - Page 81

• Manufacturer Part Number: PIC16LC74B-04/L
• Description: IC MCU OTP 4KX14 A/D PWM 44PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16LC74B-04/L

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 5x8b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

The following steps should be followed for doing an A/D
conversion:
1.
2.
FIGURE 12-1:
2000 Microchip Technology Inc.
Note 1: Not available on PIC16C73B.
Configure the A/D module:
• Configure analog pins, voltage reference,
• Select A/D input channel (ADCON0)
• Select A/D conversion clock (ADCON0)
• Turn on A/D module (ADCON0)
Configure A/D interrupt (if desired):
• Clear ADIF bit (PIR1<6>)
• Set ADIE bit (PIE1<6>)
• Set PEIE bit (INTCON<6>)
• Set GIE bit (INTCON<7>)
and digital I/O (ADCON1)
Converter
A/D
A/D BLOCK DIAGRAM
(Reference
Voltage)
V
REF
(Input Voltage)
PCFG2:PCFG0
V
IN
PIC16C63A/65B/73B/74B
V
DD
001 or
011 or
101
000 or
010 or
100 or
11x
3.
4.
5.
6.
7.
Wait the required acquisition time.
Set GO/DONE bit (ADCON0) to start conversion.
Wait for A/D conversion to complete, by either:
Polling for the GO/DONE bit to be cleared (if
interrupts are disabled);
OR
Waiting for the A/D interrupt.
Read A/D result register (ADRES), clear bit
ADIF if required.
For next conversion, go to step 1 or step 2 as
required. The A/D conversion time per bit is
defined as T
required before next acquisition starts.
CHS2:CHS0
111
110
101
100
011
010
001
000
AD
. A minimum wait of 2 T
RA1/AN1
RE2/AN7
RA2/AN2
RA0/AN0
RE1/AN6
RE0/AN5
RA5/AN4
RA3/AN3/V
DS30605C-page 81
(1)
(1)
(1)
REF
AD
is