PIC16F88

Manufacturer Part NumberPIC16F88
ManufacturerMicrochip Technology Inc.
PIC16F88 datasheet
 
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PIC16F87/88
12.2
Selecting the A/D Conversion
Clock
The A/D conversion time per bit is defined as T
A/D conversion requires 9.0 T
per 10-bit conversion.
AD
The source of the A/D conversion clock is software
selectable. The seven possible options for T
• 2 T
OSC
• 4 T
OSC
• 8 T
OSC
• 16 T
OSC
• 32 T
OSC
• 64 T
OSC
• Internal A/D module RC oscillator (2-6 s)
For correct A/D conversions, the A/D conversion clock
(T
) must be selected to ensure a minimum T
AD
as small as possible, but no less than 1.6 s and not
greater than 6.4 s.
Table 12-1 shows the resultant T
times derived from
AD
the device operating frequencies and the A/D clock
source selected.
TABLE 12-1:
T
vs. MAXIMUM DEVICE OPERATING FREQUENCIES – STANDARD DEVICES (C)
AD
AD Clock Source (T
Operation
ADCS<2>
2 T
OSC
4 T
OSC
8 T
OSC
16 T
OSC
32 T
OSC
64 T
OSC
(1,2,3)
RC
Note 1:
The RC source has a typical T
2:
When the device frequencies are greater than 1 MHz, the RC A/D conversion clock source is only
recommended for Sleep operation.
3:
For extended voltage devices (LF), please refer to Section 18.0 “Electrical Characteristics”.
DS30487C-page 118
12.3
Operation in Power-Managed
Modes
. The
The selection of the automatic acquisition time and
AD
A/D conversion clock is determined in part by the clock
source and frequency while in a power-managed
are:
mode.
AD
If the A/D is expected to operate while the device is in
a power-managed mode, the ADCS2:ADCS0 bits in
ADCON0 and ADCON1 should be updated in accor-
dance with the power-managed mode clock that will be
used. After the power-managed mode is entered
(either of the power-managed Run modes), an A/D
acquisition or conversion may be started. Once an
acquisition or conversion is started, the device should
continue to be clocked by the same power-managed
mode clock source until the conversion has been
time
AD
completed.
If the power-managed mode clock frequency is less
than 1 MHz, the A/D RC clock source should be
selected.
)
AD
ADCS<1:0>
0
00
1
00
0
01
1
01
0
10
1
10
x
11
time of 4 s, but can vary between 2-6 s.
AD
Maximum Device Frequency
Max.
1.25 MHz
2.5 MHz
5 MHz
10 MHz
20 MHz
20 MHz
(Note 1)
 2005 Microchip Technology Inc.

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