![Microchip Technology PIC12F1501 Manual Download Page 129](http://html1.mh-extra.com/html/microchip-technology/pic12f1501/pic12f1501_manual_1785833129.webp)
PIC16(L)F1508/9
DS40001609E-page 130
2011-2015 Microchip Technology Inc.
TABLE 15-1:
ADC CLOCK PERIOD (T
AD
) V
S
. DEVICE OPERATING FREQUENCIES
FIGURE 15-2:
ANALOG-TO-DIGITAL CONVERSION T
AD
CYCLES
ADC Clock Period (T
AD
)
Device Frequency (F
OSC
)
ADC
Clock
Source
ADCS<2:0
>
20 MHz
16 MHz
8 MHz
4 MHz
1 MHz
Fosc/2
000
100 ns
125 ns
250 ns
500 ns
2.0
s
Fosc/4
100
200 ns
250 ns
500 ns
1.0
s
4.0
s
Fosc/8
001
400 ns
500 ns
1.0
s
2.0
s
8.0
s
Fosc/16
101
800 ns
1.0
s
2.0
s
4.0
s
16.0
s
Fosc/32
010
1.6
s
2.0
s
4.0
s
8.0
s
32.0
s
Fosc/64
110
3.2
s
4.0
s
8.0
s
16.0
s
64.0
s
FRC
x11
1.0-6.0
s
1.0-6.0
s
1.0-6.0
s
1.0-6.0
s
1.0-6.0
s
Legend:
Shaded cells are outside of recommended range.
Note:
The T
AD
period when using the FRC clock source can fall within a specified range, (see
parameter).
The T
AD
period when using the F
OSC
-based clock source can be configured for a more precise T
AD
period.
However, the FRC clock source must be used when conversions are to be performed with the device in
Sleep mode.
T
AD
1
T
AD
2
T
AD
3
T
AD
4
T
AD
5
T
AD
6
T
AD
7
T
AD
8
T
AD
9
T
AD
10
T
AD
11
Set GO bit
Conversion Starts
Holding capacitor disconnected
from analog input (THCD).
On the following cycle:
ADRESH:ADRESL is loaded,
GO bit is cleared,
ADIF bit is set,
holding capacitor is reconnected to analog input.
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
Enable ADC (ADON bit)
and
Select channel (ACS bits)
T
HCD
T
ACQ
Rev. 10-000035A
7/30/2013