A-D Converter
M30240 Group
Rev.1.00 Sep 24, 2003 Page 240 of 360
Figure 2.86: Set-up procedure of single-sweep mode
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 03C116, 03C016] AD0
A-D register 1 [Address 03C3
16, 03C216] AD1
A-D register 2 [Address 03C5
16, 03C416] AD2
A-D register 3 [Address 03C7
16, 03C616] AD3
A-D register 4 [Address 03C9
16, 03C816] AD4
A-D register 5 [Address 03CB
16, 03CA16] AD5
A-D register 6 [Address 03CD
16, 03CC16] AD6
A-D register 7 [Address 03CF
16, 03CE16] AD7
During 10-bit mode
Two high-order bits of A-D conversion result
During 8-bit mode
When read, the content is indeterminate
Start A-D conversion
Stop A-D conversion
b7 b0
Setting A-D control register 0 and A-D control register 1
A-D control register 0
[Address 03D6
16] ADCON0
A-D sweep pin select bit (Note)
0 0 : AN
0, AN1 (2 pins)
0 1 : AN
0 to AN3 (4 pins)
1 0 : AN
0 to AN5 (6 pins)
1 1 : AN
0 to AN7 (8 pins)
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 Single sweep mode)
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
Frequency select bit 1
0 : f
AD/2 or fAD/4 is selected
1 : f
AD is selected
Single sweep mode is selected
(Note)
Trigger select bit
0 : Software trigger
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
0010
Vref connect bit
1 : Vref connected
Reserved bits. Always set to "0"
00 01
Invalid in single sweep mode
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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