119
A-D converter
M
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t
s
u
M
S
b
i
s
3
M
h
0
I
C
i
m
2
R
i
1
O
c
r
8
C
o
c
o
G
M
m
p
r
P
u
t
u
T
e
r
p
R
s
o
U
S
I
N
G
L
E
-
C
H
I
P
1
6
-
B
I
T
C
M
O
O
E
(1) One-shot mode
In one-shot mode, the pin selected using the analog input pin select bit is used for one-shot A-D conversion. Table
31 shows the specifications of one-shot mode. Figure 104 shows the A-D control register in one-shot mode.
Table 31. One-shot mode specifications
Item
Specification
Function
Start condition
Stop condition
The pin selected by the analog input pin select bit is used for one A-D conversion
Writing “1” to A-D conversion start flag
End of A-D conversion (A-D conversion start flag changes to “0”)
Writing “0” to A-D conversion start flag
Interrupt request generation timing
End of A-D conversion
Input pin
One of AN
0
to AN
7
, as selected
Reading of result of A-D converter
Read A-D register corresponding to selected pin
Figure 104. A-D conversion register in one-shot mode
A-D control register 0 (Note)
Symbol
ADCON0
Address
03D6
16
When reset
00000XXX
2
R
Bit name
Function
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
Analog input pin
select bit
CH0
CH1
CH2
A-D operation mode
select bit 0
MD0
MD1
ADST
A-D conversion start flag
0 : A-D conversion disabled
1 : A-D conversion started
0: f
AD
/4 is selected
1: f
AD
/2 is selected
Frequency select bit 0
CKS0
W
0
0
A-D control register 1 (Note)
Symbol
ADCON1
Address
03D7
16
When reset
00
16
Bit name
Function
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
A-D sweep pin
select bit
SCAN0
SCAN1
MD2
BITS
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
0 : f
AD
/2 or f
AD
/4 is selected
1 : f
AD
is selected
VCUT
Vref connect bit
A-D operation mode
select bit 1
0 : Any mode other than repeat sweep
mode 1
1 : Vref connected
W
R
Invalid in one-shot mode
0
0 0 0 : AN
0
is selected
0 0 1 : AN
1
is selected
0 1 0 : AN
2
is selected
0 1 1 : AN
3
is selected
1 0 0 : AN
4
is selected
1 0 1 : AN
5
is selected
1 1 0 : AN
6
is selected
1 1 1 : AN
7
is selected
b2 b1 b0
0 0 : One-shot mode
1
Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Frequency select bit1
CKS1
Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Must always be “0”.
Must always be “0”.
0
0
0