16F876 Microchip Technology, 16F876 Datasheet - Page 117

• Manufacturer Part Number: 16F876
• Description: 28/40-pin 8-Bit CMOS FLASH Microcontrollers
• Manufacturer: Microchip Technology

11.4
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 aborted, a 2T
FIGURE 11-3: A/D CONVERSION T
1999 Microchip Technology Inc.
conversion
A/D Conversions
T
CY
Set GO bit
Holding capacitor is disconnected from analog input (typically 100 ns)
to T
AD
Conversion Starts
sample.
T
AD
1
T
AD
b9
2
That
T
AD
b8
3
AD
T
AD
is,
AD
b7
CYCLES
4
wait is
T
the
AD
b6
5
T
AD
b5
6
required before the next acquisition is started. After
this 2T
automatically started.
In Figure 11-3, after the GO bit is set, the first time seg-
mant has a minimum of T
ADRES is loaded,
GO bit is cleared,
ADIF bit is set,
holding capacitor is connected to analog input.
T
AD
b4
Note:
7
AD
T
AD
b3
wait, acquisition on the selected channel is
8
The GO/DONE bit should NOT be set in
the same instruction that turns on the A/D.
T
AD
b2
9
T
AD
b1
10 T
CY
PIC16F87X
and a maximum of T
AD
b0
11
DS30292B-page 117
AD
.