PIC18F45J10-I/PT Microchip Technology Inc., PIC18F45J10-I/PT Datasheet - Page 217
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PIC18F45J10-I/PT
Manufacturer Part Number
PIC18F45J10-I/PT
Description
44 PIN, 32 KB FLASH, 1024 RAM
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F45J10-IPT.pdf
(359 pages)
Specifications of PIC18F45J10-I/PT
A/d Inputs
13-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
0 Bytes
Input Output
32
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
44-pin TQFP
Programmable Memory
32K Bytes
Ram Size
1K Bytes
Speed
40 MHz
Timers
1-8 bit, 2-16 bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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17.2
The ADCON2 register allows the user to select an
acquisition time that occurs each time the GO/DONE
bit is set. It also gives users the option to use an
automatically determined acquisition time.
Acquisition time may be set with the ACQT2:ACQT0
bits (ADCON2<5:3>), which provides a range of 2 to
20 T
continues to sample the input for the selected acquisi-
tion time, then automatically begins a conversion.
Since the acquisition time is programmed, there may
be no need to wait for an acquisition time between
selecting a channel and setting the GO/DONE bit.
Manual
ACQT2:ACQT0 = 000. When the GO/DONE bit is set,
sampling is stopped and a conversion begins. The user
is responsible for ensuring the required acquisition time
has passed between selecting the desired input
channel and setting the GO/DONE bit. This option is
also the default Reset state of the ACQT2:ACQT0 bits
and is compatible with devices that do not offer
programmable acquisition times.
In either case, when the conversion is completed, the
GO/DONE bit is cleared, the ADIF flag is set and the
A/D begins sampling the currently selected channel
again. If an acquisition time is programmed, there is
nothing to indicate if the acquisition time has ended or
if the conversion has begun.
TABLE 17-1:
© 2006 Microchip Technology Inc.
Note 1:
AD
. When the GO/DONE bit is set, the A/D module
2:
3:
4:
Selecting and Configuring
Acquisition Time
Operation
The RC source has a typical T
The RC source has a typical T
For device frequencies above 1 MHz, the device must be in Sleep for the entire conversion or the A/D
accuracy may be out of specification.
Low-power (PIC18LF2XJ10/4XJ10) devices only.
16 T
32 T
64 T
acquisition
2 T
4 T
8 T
RC
OSC
OSC
OSC
OSC
OSC
OSC
(3)
AD Clock Source (T
T
AD
vs. DEVICE OPERATING FREQUENCIES
is
selected
ADCS2:ADCS0
AD
)
AD
AD
000
100
001
101
010
110
x11
time of 1.2 μs.
time of 2.5 μs.
when
Preliminary
PIC18F45J10 FAMILY
PIC18F2XJ10/4XJ10
17.3
The A/D conversion time per bit is defined as T
A/D conversion requires 11 T
The source of the A/D conversion clock is software
selectable. There are seven possible options for T
• 2 T
• 4 T
• 8 T
• 16 T
• 32 T
• 64 T
• Internal RC Oscillator
For correct A/D conversions, the A/D conversion clock
(T
minimum
information).
Table 17-1 shows the resultant T
the device operating frequencies and the A/D clock
source selected.
AD
22.86 MHz
) must be as short as possible, but greater than the
11.43 MHz
1.00 MHz
2.86 MHz
5.71 MHz
40.0 MHz
40.0 MHz
OSC
OSC
OSC
OSC
OSC
OSC
Selecting the A/D Conversion
Clock
Maximum Device Frequency
T
AD
(1)
(see
parameter
PIC18LF2XJ10/4XJ10
AD
per 10-bit conversion.
AD
1.00 MHz
11.43 MHz
22.86 MHz
1.43 MHz
2.86 MHz
5.72 MHz
40.0 MHz
DS39682B-page 215
times derived from
130
(2)
for
AD
. The
more
AD
(4)
:
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