A-D Converter
M30240 Group
Rev.1.00 Sep 24, 2003 Page 236 of 360
Figure 2.82: Set-up procedure of one-shot mode with an external trigger selected
b7 b0
1
Setting A-D conversion start flag
A-D control register 0 [Address 03D6
16
]
ADCON0
A-D conversion start flag
1 : A-D conversion started
Reading conversion result
Eight low-order bits of A-D conversion result
b7 b0
(b15) (b8)
b7 b0
A-D register 0 [Address 03C1
16
, 03C0
16
] AD0
A-D register 1 [Address 03C3
16
, 03C2
16
] AD1
A-D register 2 [Address 03C5
16
, 03C4
16
] AD2
A-D register 3 [Address 03C7
16
, 03C6
16
] AD3
A-D register 4 [Address 03C9
16
, 03C8
16
] AD4
A-D register 5 [Address 03CB
16
, 03CA
16
] AD5
A-D register 6 [Address 03CD
16
, 03CC
16
] AD6
A-D register 7 [Address 03CF
16
, 03CE
16
] AD7
During 10-bit mode
Two high-order bits of A-D conversion result
During 8-bit mode
When read, the content is indeterminate
b7 b0
Setting A-D control register 0 and A-D control register 1
A-D control register 0 [Address 03D6
16
]
ADCON0
Analog input pin select bit (Note)
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
b7 b0
A-D control register 1 [Address 03D7
16
]
ADCON1
A-D operation mode select bit 1 (Note)
0 (Must always be “0” in one-shot mode)
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
Frequency select bit 1
0 : f
AD
/2 or f
AD
/4 is selected
1 : f
AD
is selected
One-shot mode is selected (Note)
A-D conversion start flag
0 : A-D conversion disabled
Frequency select bit 0
0 : f
AD
/4 is selected
1 : f
AD
/2 is selected
1000
Invalid in one-shot mode
Vref connect bit
1 : Vref connected
Reserved bits. Always set to "0"
00 01
Trigger select bit
1 : AD
TRG
trigger
Start A-D conversion
When ADTRG pin level changes from “H” to “L”
b7 b0
0
Setting A-D conversion start flag
A-D control register 0 [Address 03D6
16
]
ADCON0
A-D conversion start flag
0 : A-D conversion disabled
Stop A-D conversion
b7 b0
Selecting sample and hold
A-D control register 2 [Address 03D4
16
]
ADCON2
A-D conversion method select bit
1 : With sample and hold
1
Note: Rewrite the analog input pin select bit after changing A-D operation mode.
0
0
0
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