PIC16F721-E/SO Microchip Technology, PIC16F721-E/SO Datasheet - Page 79

• Manufacturer Part Number: PIC16F721-E/SO
• Description: 7 KB FLASH, 256 B SRAM, 18 I/O 20 SOIC .300in TUBE
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F721-E/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FIGURE 9-2:
9.1.4
The ADC module allows for the ability to generate an
interrupt upon completion of an Analog-to-Digital
conversion. The ADC Interrupt Flag is the ADIF bit in
the PIR1 register. The ADC Interrupt Enable is the
ADIE bit in the PIE1 register. The ADIF bit must be
cleared in software.
This interrupt can be generated while the device is
operating or while in Sleep. If the device is in Sleep, the
interrupt will wake-up the device. Upon waking from
Sleep, the next instruction following the SLEEP
instruction is always executed. If the user is attempting
to wake-up from Sleep and resume in-line code
execution, the GIE and PEIE bits of the INTCON
register must be disabled. If the GIE and PEIE bits of
the INTCON register are enabled, execution will switch
to the Interrupt Service Routine.
Please refer to
information.
 2010 Microchip Technology Inc.
Note 1: The ADIF bit is set at the completion of
2: The ADC operates during Sleep only
T
CY
INTERRUPTS
every conversion, regardless of whether
or not the ADC interrupt is enabled.
when the F
to T
Set GO/DONE bit
Section 9.1.4 “Interrupts”
Holding Capacitor is disconnected from Analog Input (typically 100 ns)
AD
T
AD
0
ANALOG-TO-DIGITAL CONVERSION T
RC
Conversion Starts
oscillator is selected.
T
AD
1
T
AD
b7
2
T
for more
AD
b6
3
T
AD
b5
4
T
9.2
9.2.1
To enable the ADC module, the ADON bit of the
ADCON0 register must be set to a ‘1’. Setting the GO/
DONE bit of the ADCON0 register to a ‘1’ will start the
Analog-to-Digital conversion.
9.2.2
When the conversion is complete, the ADC module will:
• Clear the GO/DONE bit
• Set the ADIF Interrupt Flag bit
• Update the ADRES register with new conversion
9.2.3
If a conversion must be terminated before completion,
the GO/DONE bit can be cleared in software. The
ADRES register will be updated with the partially com-
plete Analog-to-Digital conversion sample. Incomplete
bits will match the last bit converted.
AD
ADRES register is loaded,
GO/DONE bit is cleared,
ADIF bit is set,
Holding capacitor is connected to analog input
b4
Note:
result
Note:
5
AD
PIC16F/LF720/721
T
CYCLES
AD
ADC Operation
b3
6
STARTING A CONVERSION
The GO/DONE bit should not be set in the
same instruction that turns on the ADC.
Refer to
Procedure”.
COMPLETION OF A CONVERSION
TERMINATING A CONVERSION
A device Reset forces all registers to their
Reset state. Thus, the ADC module is
turned off and any pending conversion is
terminated.
T
AD
b2
7
Section 9.2.6 “A/D Conversion
T
AD
b1
8
T
AD
b0
DS41430A-page 79
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