PIC16F716 Microchip Technology, PIC16F716 Datasheet - Page 54

• Manufacturer Part Number: PIC16F716
• Description: 8-bit Flash-based Microcontroller with A/D Converter and Enhanced Capture/Compare/PWM
• Manufacturer: Microchip Technology

PIC16F716
8.2
The A/D conversion time per bit is defined as T
A/D conversion requires 9.5 T
The source of the A/D conversion clock is software
selectable. The four possible options for T
• 2 T
• 8 T
• 32 T
• Internal RC oscillator
For correct A/D conversions, the A/D conversion clock
(T
of 1.6 s.
Table 8-1 shows the resultant T
the device operating frequencies and the A/D clock
source selected.
TABLE 8-1:
DS41206A-page 52
Operation
2 T
8 T
32 T
RC
Legend:
Note 1:
AD
OSC
OSC
) must be selected to ensure a minimum T
OSC
OSC
OSC
OSC
2:
3:
4:
AD Clock Source (T
Selecting the A/D Conversion
Clock
Shaded cells are outside of recommended range.
The RC source has a typical T
These values violate the minimum required T
For faster conversion times, the selection of another clock source is recommended.
When device frequency is greater than 1 MHz, the RC A/D conversion clock source is recommended for
Sleep operation only.
T
AD
ADCS1:ADCS0
vs. DEVICE OPERATING FREQUENCIES
00
01
10
11
AD
AD
)
AD
per 8-bit conversion.
times derived from
AD
AD
2-6 s
100 ns
400 ns
are:
time of 4 s.
20 MHz
1.6 s
AD
AD
. The
(1), (4)
time
Preliminary
(2)
(2)
AD
time.
2-6 s
8.3
The ADCON1 and TRISA registers control the
operation of the A/D port pins. The port pins that are
desired as analog inputs must have their correspond-
ing TRIS bits set (input). If the TRIS bit is cleared
(output), the digital output level (V
converted.
The A/D operation is independent of the state of the
CHS2:CHS0 bits and the TRIS bits.
400 ns
5 MHz
1.6 s
6.4 s
Note 1: When reading the port register, all pins
Device Frequency
(1), (4)
(2)
2: Analog levels on any pin that is defined as
Configuring Analog Port Pins
configured as analog input channels will
read as cleared (a low level). Pins
configured as digital inputs, will convert
an analog input. Analog levels on a
digitally configured input will not affect the
conversion accuracy.
a digital input (including the AN3:AN0
pins), may cause the input buffer to
consume current that is out of the devices
specification.
2-6 s
1.25 MHz
25.6 s
1.6 s
6.4 s
 2003 Microchip Technology Inc.
(1), (4)
(3)
OH
333.33 kHz
or V
2-6 s
24 s
96 s
6 s
OL
) will be
(3)
(3)
(1)