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鍨嬭櫉锛� PIC16F1513-I/SS
寤犲晢锛� Microchip Technology
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PIC16(L)F1512/3
DS41624B-page 144
Preliminary
2012 Microchip Technology Inc.
TABLE 16-5:
ADC CLOCK PERIOD (TAD) VS. DEVICE OPERATING FREQUENCIES
FIGURE 16-6:
ANALOG-TO-DIGITAL SINGLE CONVERSION (ADDSEN = 0) TAD CYCLES
ADC Clock Period (TAD)
Device Frequency (FOSC)
ADC
Clock Source
ADCS<2:0>
20 MHz
16 MHz
8 MHz
4 MHz
1 MHz
Fosc/2
000
100 ns(2)
125 ns(2)
250 ns(2)
500 ns(2)
2.0
s
Fosc/4
100
200 ns(2)
250 ns(2)
500 ns(2)
1.0
s4.0 s
Fosc/8
001
400 ns(2)
0.5
s(2)
1.0
s2.0 s
8.0
s(3)
Fosc/16
101
800 ns
1.0
s2.0 s4.0 s
16.0
s(3)
Fosc/32
010
1.6
s2.0 s4.0 s
8.0
s(3)
32.0
s(3)
Fosc/64
110
3.2
s4.0 s
8.0
s(3)
16.0
s(3)
64.0
s(3)
FRC
x11
1.0-6.0
s(1,4)
1.0-6.0
s(1,4)
1.0-6.0
s(1,4)
1.0-6.0
s(1,4)
1.0-6.0
s(1,4)
Legend:
Shaded cells are outside of recommended range.
Note 1:
The FRC source has a typical TAD time of 1.6
s for VDD.
2:
These values violate the minimum required TAD time.
3:
For faster conversion times, the selection of another clock source is recommended.
4:
The ADC clock period (TAD) and total ADC conversion time can be minimized when the ADC clock is
derived from the system clock FOSC. However, the FRC clock source must be used when conversions are
to be performed with the device in Sleep mode.
TAD1 TAD2 TAD3 TAD4 TAD5 TAD6 TAD7 TAD8
TAD11
Set GO/DONE bit
Holding capacitor CHOLD is disconnected from analog input (typically 100 ns)
TAD9 TAD10
TCY - TAD
AADRES0H:AADRES0L is loaded,
ADIF bit is set,
Conversion starts
b0
b9
b6
b5
b4
b3
b2
b1
b8
b7
On the following cycle:
1-127 TINST
Pre-Charge
Acquisition/
Sharing Time
Time
Conversion Time
If ADPRE = 0
If ADACQ = 0
If ADPRE = 0
If ADACQ = 0
GO/DONE bit is cleared
(Traditional Timing of ADC Conversion)
External and Internal
Channels are
charged/discharged
External and Internal
Channels share
charge
(Traditional Operation Start)
(TPRE)
(TACQ)
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