PIC18F2480 MICROCHIP [Microchip Technology], PIC18F2480 Datasheet - Page 257
PIC18F2480
Manufacturer Part Number
PIC18F2480
Description
28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F2480.pdf
(484 pages)
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19.6
Figure 19-3 shows the operation of the A/D converter
after the GO bit has been set and the ACQT2:ACQT0
bits are cleared. A conversion is started after the follow-
ing instruction to allow entry into Sleep mode before the
conversion begins.
Figure 19-4 shows the operation of the A/D converter
after the GO bit has been set and the ACQT2:ACQT0
bits are set to ‘010’ and selecting a 4 T
time before the conversion starts.
FIGURE 19-3:
FIGURE 19-4:
2004 Microchip Technology Inc.
(Holding capacitor continues
acquiring input)
Set GO bit
T
CY
Set GO bit
A/D Conversions
Holding capacitor is disconnected from analog input (typically 100 ns)
1
- T
T
AD
ACQT
Conversion starts
Acquisition
Automatic
2
T
Time
AD
Cycles
1 T
A/D CONVERSION T
A/D CONVERSION T
3
AD
b9
2 T
4
AD
b8
Conversion starts
(Holding capacitor is disconnected)
3 T
1
AD
b7
AD
4 T
b9
2
acquisition
AD
PIC18F2480/2580/4480/4580
b6
AD
AD
5 T
On the following cycle:
ADRESH:ADRESL is loaded, GO bit is cleared,
ADIF bit is set, holding capacitor is connected to analog input.
On the following cycle:
ADRESH:ADRESL is loaded, GO bit is cleared,
ADIF bit is set, holding capacitor is connected to analog input.
b8
3
CYCLES (ACQT<2:0> = 000, T
CYCLES (ACQT<2:0> = 010, T
Preliminary
AD
b5
6 T
b7
4
AD
b4
7 T
T
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
be started. After this wait, acquisition on the selected
channel is automatically started.
5
b6
AD
AD
b3
Note:
AD
Cycles
8
b5
wait is required before the next acquisition can
6
conversion
T
AD
b2
9 T
The GO/DONE bit should NOT be set in
the same instruction that turns on the A/D.
b4
7
AD
b1
10
b3
T
8
AD
sample.
b0
ACQ
11
ACQ
b2
9
= 0)
= 4 T
10
This
b1
AD
DS39637A-page 255
)
b0
11
means
the
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