PIC16F684-E/P Microchip Technology, PIC16F684-E/P Datasheet - Page 69

• Manufacturer Part Number: PIC16F684-E/P
• Description: IC PIC MCU FLASH 2KX14 14DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F684-E/P

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 14-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014, DM164120-4
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM163029 - BOARD PICDEM FOR MECHATRONICSACICE0207 - MPLABICE 14P 300 MIL ADAPTER
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

9.1.7
After the A/D module has been configured as desired,
the selected channel must be acquired before the
conversion is started. The analog input channels must
have their corresponding TRIS bits selected as inputs.
To determine sample time, see Section 15.0 “Electri-
cal Specifications”. After this sample time has
elapsed, the A/D conversion can be started.
These steps should be followed for an A/D conversion:
1.
2.
3.
4.
5.
6.
7.
 2004 Microchip Technology Inc.
Configure the A/D module:
• Configure analog/digital I/O (ANSEL)
• Configure voltage reference (ADCON0)
• Select A/D input channel (ADCON0)
• Select A/D conversion clock (ADCON1)
• Turn on A/D module (ADCON0)
Configure A/D interrupt (if desired):
• Clear ADIF bit (PIR1<6>)
• Set ADIE bit (PIE1<6>)
• Set PEIE and GIE bits (INTCON<7:6>)
Wait the required acquisition time.
Start conversion:
• Set GO/DONE bit (ADCON0<0>)
Wait for A/D conversion to complete, by either:
• Polling for the GO/DONE bit to be cleared
• Waiting for the A/D interrupt
Read A/D Result register pair
(ADRESH:ADRESL), 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 the next acquisition starts.
(with interrupts disabled); OR
CONFIGURING THE A/D
AD
. A minimum wait of 2 T
AD
is
Preliminary
EXAMPLE 9-1:
;This code block configures the A/D
;for polling, Vdd reference, R/C clock
;and RA0 input.
;
;Conversion start & wait for complete
;polling code included.
;
BSF
MOVLW B’01110000’
MOVWF ADCON1
BSF
BSF
BCF
MOVLW B’10000001’
MOVWF ADCON0
CALL
BSF
BTFSC ADCON0,GO
GOTO
MOVF
MOVWF RESULTHI
BSF
MOVF
MOVWF RESULTLO
STATUS,RP0
TRISA,0
ANSEL,0
STATUS,RP0
SampleTime
ADCON0,GO
$-1
ADRESH,W
STATUS,RP0
ADRESL,W
A/D CONVERSION
PIC16F684
;Bank 1
;A/D RC clock
;Set RA0 to input
;Set RA0 to analog
;Bank 0
;Right, Vdd Vref, AN0
;Wait min sample time
;Start conversion
;Is conversion done?
;No, test again
;Read upper 2 bits
;Bank 1
;Read lower 8 bits
DS41202C-page 67