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335
A-D Converter
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Figure 2.8.8. Set-up procedure of repeat 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
Transmitting conversion result to A-D register i
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 03C316, 03C216]
AD1
A-D register 2
[Address 03C516, 03C416]
AD2
A-D register 3
[Address 03C716, 03C616]
AD3
A-D register 4
[Address 03C916, 03C816]
AD4
A-D register 5
[Address 03CB16, 03CA16] AD5
A-D register 6
[Address 03CD16, 03CC16] AD6
A-D register 7
[Address 03CF16, 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
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 : AN0 is selected
0 0 1 : AN1 is selected
0 1 0 : AN2 is selected
0 1 1 : AN3 is selected
1 0 0 : AN4 is selected
1 0 1 : AN5 is selected
1 1 0 : AN6 is selected
1 1 1 : AN7 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 repeat mode)
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
Frequency select bit 1
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
Repeat mode is selected (Note)
A-D conversion start flag
0 : A-D conversion disabled
Frequency select bit 0
0 : fAD/4 is selected
1 : fAD/2 is selected
0
00
1
Invalid in Repeat mode
Vref connect bit
1 : Vref connected
Nothing is arranged for these bits.
Fix “0” to these bits
00
0
1
Nothing is arranged for this bit.
Fix “0” to this bit.
Start A-D conversion
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 to analog input pin select bit after changing A-D operation mode.