PIC18F24J11 MICROCHIP [Microchip Technology], PIC18F24J11 Datasheet - Page 358
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PIC18F24J11
Manufacturer Part Number
PIC18F24J11
Description
28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F24J11.pdf
(536 pages)
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PIC18F46J11 FAMILY
21.5
Figure 21-3
after the GO/DONE bit has been set and the
ACQT<2:0> bits are cleared. A conversion is started
after the following instruction to allow entry into Sleep
mode before the conversion begins.
Figure 21-4
after the GO/DONE bit has been set, the ACQT<2:0>
bits are set to ‘010’ and a 4 T
been selected before the conversion starts.
Clearing the GO/DONE bit during a conversion will
abort the current conversion. The A/D Result register
pair will NOT be updated with the partially completed
A/D
ADRESH:ADRESL registers will continue to contain
the value of the last completed conversion (or the last
value written to the ADRESH:ADRESL registers).
After the A/D conversion is completed or aborted, a
2 T
started. After this wait, acquisition on the selected
channel is automatically started.
FIGURE 21-3:
FIGURE 21-4:
DS39932D-page 358
Note:
(Holding capacitor continues
acquiring input)
AD
Set GO/DONE bit
wait is required before the next acquisition can be
1
conversion
A/D Conversions
T
T
Set GO/DONE bit
CY
Automatic
Acquisition
Time
ACQT
Holding capacitor is disconnected from analog input (typically 100 ns)
The GO/DONE bit should NOT be set in
the same instruction that turns on the A/D.
displays the operation of the A/D Converter
displays the operation of the A/D Converter
2
- T
AD
Cycles
Conversion starts
T
3
AD
sample.
A/D CONVERSION T
A/D CONVERSION T
1 T
4
AD
b9
2 T
Conversion starts
(Holding capacitor is disconnected)
AD
1
This
AD
acquisition time has
b8
3 T
b9
2
AD
means
Next Q4: ADRESH:ADRESL are loaded, GO/DONE bit is cleared,
b7
Next Q4: ADRESH/ADRESL are loaded, GO/DONE bit is cleared,
4 T
b8
3
AD
AD
AD
b6
5 T
CYCLES (ACQT<2:0> = 000, T
CYCLES (ACQT<2:0> = 010, T
ADIF bit is set, holding capacitor is reconnected to analog input.
the
ADIF bit is set, holding capacitor is connected to analog input.
b7
4
AD
b5
6 T
T
5
b6
AD
AD
b4
7 T
Cycles
21.6
An A/D conversion can be started by the Special Event
Trigger of the ECCP2 module. This requires that the
CCP2M<3:0> bits (CCP2CON<3:0>) be programmed
as ‘1011’ and that the A/D module is enabled (ADON
bit is set). When the trigger occurs, the GO/DONE bit
will be set, starting the A/D acquisition and conversion,
and the Timer1 (or Timer3) counter will be reset to zero.
Timer1 (or Timer3) is reset to automatically repeat the
A/D acquisition period with minimal software overhead
(moving ADRESH/ADRESL to the desired location).
The appropriate analog input channel must be selected
and the minimum acquisition period is either timed by
the user, or an appropriate T
the Special Event Trigger sets the GO/DONE bit (starts
a conversion).
If the A/D module is not enabled (ADON is cleared), the
Special Event Trigger will be ignored by the A/D module
but will still reset the Timer1 (or Timer3) counter.
b5
6
AD
b3
8
Use of the ECCP2 Trigger
b4
T
7
AD
b2
9 T
b3
8
AD
b1
10
ACQ
ACQ
T
b2
9
AD
2011 Microchip Technology Inc.
b0
11
ACQ
= 0)
= 4 T
10
b1
time is selected before
AD
b0
)
11
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