A-D Converter
M30240 Group
Rev.1.00 Sep 24, 2003 Page 105 of 360
1.2.24.3 Single-sweep mode
In single-sweep mode, the pins selected using the A-D sweep pin select bit are used for one-by-one
A-D conversion. Table 1.33 shows the specifications of single-sweep mode. Figure 1.101 shows the
A-D control register in single-sweep mode.
Figure 1.101: A-D conversion register in single-sweep mode
Table 1.33: Single-sweep mode specification
Item Specification
Function The pins selected by the A-D sweep pin select bit are used for one-by-one A-D conversion
Start condition Writing “1” to A-D converter start flag
Stop condition
•End of A-D conversion (A-D conversion start flag changes to “0”, except when external trigger is
selected)
•Writing “0” to A-D conversion start flag
Interrupt request
generation timing
End of A-D conversion
Input pin AN
0
and AN
1
(2 pins), AN
0
to AN
3
(4 pins), AN
0
to AN
5
(6 pins), or AN
0
to AN
7
(8 pins)
Reading of result
of A-D converter
Read A-D register corresponding to selected pin
A-D control register 0
(Note)
Symbol
Address
When reset
ADCON0
03D6
16
00000XXX
2
b7 b6 b5 b4 b3 b2 b1 b0
Analog input pin
select bit
CH0
Bit symbol Bit name Function
CH1
CH2
A-D operation mode
select bit 0
1 0 : Single sweep mode
MD0
MD1
Trigger select bit 0 : Software trigger
1 : AD
TRG
trigger
TRG
ADST
A-D conversion start flag 0 : A-D conversion disabled
1 : A-D conversion started
Frequency select bit 0 0 : f
AD
/4 is selected
1 : f
AD
/2 is selected
CKS0
WR
A-D control register 1 (Note)
Symbol
Address
When reset
ADCON1
03D7
16
00
16
Bit name FunctionBit 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
VCUT
Vref connect bit
0 : Any mode other than repeat sweep mode 1
A-D operation mode
select bit 1
1 : Vref connected
WR
1
0
Invalid in single sweep mode
0
Note : If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
b4 b3
When single sweep and repeat sweep mode 0
are selected
0 0 : AN
0
, AN
1
(2 pins)
0 1 : AN
0
to AN
3
(4 pins)
1 0 : AN
0
to AN
5
(6 pins)
1 1 : AN
0
to AN
7
(8 pins)
b1 b0
1
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Frequency select bit 1
0 : f
AD
/2 or f
AD
/4 is selected
1 : f
AD
is selected
CKS1
Reserved bit Always set to "0"
0
0
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