參數(shù)資料
型號(hào): 16F871
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE GREEN 6 FT
中文描述: 28/40-Pin 8位CMOS閃存微控制器
文件頁數(shù): 85/156頁
文件大小: 2816K
代理商: 16F871
1999 Microchip Technology Inc.
Preliminary
DS30569A-page 85
PIC16F870/871
10.4
A/D Conversions
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
conversion
sample.
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
AD
wait is
That
is,
the
required before the next acquisition is started. After
this 2T
AD
wait, acquisition on the selected channel is
automatically started.
In Figure 10-3, after the GO bit is set, the first time seg-
mant has a minimum of T
CY
and a maximum of T
AD
.
FIGURE 10-3: A/D CONVERSION T
AD
CYCLES
Note:
The GO/DONE bit should
NOT
be set in
the same instruction that turns on the A/D.
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
Set GO bit
Holding capacitor is disconnected from analog input (typically 100 ns)
b9
b8
b7
b6
b5
b4
b3
b2
T
AD
10 T
AD
11
b1
b0
T
CY
to T
AD
Conversion Starts
ADRES is loaded,
GO bit is cleared,
ADIF bit is set,
holding capacitor is connected to analog input.
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