AC164112 Microchip Technology, AC164112 Datasheet - Page 100
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AC164112
Manufacturer Part Number
AC164112
Description
VOLTAGE LIMITER MPLAB ICD2 VPP
Manufacturer
Microchip Technology
Datasheet
1.AC164112.pdf
(302 pages)
Specifications of AC164112
Accessory Type
Voltage Limiter
Product
Cable Assemblies
Features
Programming And Debugging The Latest PIC12/PIC16/PIC18 Products
Development Tool Type
Hardware - Eval/Demo Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
MPLAB®
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With
MPLAB ICD 2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
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PIC16F72X/PIC16LF72X
9.1
When configuring and using the ADC the following
functions must be considered:
• Port configuration
• Channel selection
• ADC voltage reference selection
• ADC conversion clock source
• Interrupt control
• Results formatting
9.1.1
The ADC can be used to convert both analog and
digital signals. When converting analog signals, the I/O
pin should be configured for analog by setting the
associated TRIS and ANSEL bits. Refer to Section 6.0
“I/O Ports” for more information.
9.1.2
The CHS bits of the ADCON0 register determine which
channel is connected to the sample and hold circuit.
When changing channels, a delay is required before
starting the next conversion. Refer to Section 9.2
“ADC Operation” for more information.
9.1.3
The ADREF bits of the ADCON1 register provides
control of the positive voltage reference. The positive
voltage reference can be either V
voltage source or the internal Fixed Voltage Reference.
The negative voltage reference is always connected to
the ground reference. See Section 10.0 “Fixed
Voltage Reference” for more details on the Fixed
Voltage Reference.
9.1.4
The source of the conversion clock is software select-
able via the ADCS bits of the ADCON1 register. There
are seven possible clock options:
• F
• F
• F
• F
• F
• F
• F
The time to complete one bit conversion is defined as
T
as shown in Figure 9-2.
DS41341E-page 100
AD
Note:
OSC
OSC
OSC
OSC
OSC
OSC
RC
. One full 8-bit conversion requires 10 T
(dedicated internal oscillator)
/2
/4
/8
/16
/32
/64
ADC Configuration
PORT CONFIGURATION
Analog voltages on any pin that is defined
as a digital input may cause the input
buffer to conduct excess current.
CHANNEL SELECTION
ADC V
CONVERSION CLOCK
OLTAGE REFERENCE
DD
, an external
AD
periods
For correct conversion, the appropriate T
tion must be met. Refer to the A/D conversion require-
ments in Section 23.0 “Electrical Specifications” for
more information. Table 9-1 gives examples of appro-
priate ADC clock selections.
Note:
Unless using the F
system clock frequency will change the
ADC
adversely affect the ADC result.
clock
© 2009 Microchip Technology Inc.
frequency,
RC
, any changes in the
which
AD
specifica-
may
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