Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
A-D Converter
297
Figure 2.7.12. Set-up procedure of repeat sweep 0 mode
b7
b0
1
Setting A-D conversion start flag
A-D control register 0 [Address 03D616]
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 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
Start A-D conversion
b7
b0
Selecting Sample and hold
A-D control register 2 [Address 03D416]
ADCON2
A-D conversion method select bit
1 : With sample and hold
1
0
Must be fixed to “0”
b7
b0
0
Setting A-D conversion start flag
A-D control register 0 [Address 03D616]
ADCON0
A-D conversion start flag
0 : A-D conversion disabled
Stop A-D conversion
b7
b0
Setting A-D control register 0 and A-D control register 1
A-D control register 0 [Address 03D616]
ADCON0
Invalid in repeat sweep mode 0
b7
b0
A-D control register 1 [Address 03D716]
ADCON1
A-D operation mode select bit 1 (Note 1)
0 (Must always be “0” in repeat sweep mode 0)
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 sweep mode 0 is selected (Note 1)
Must be fixed to “0”
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
01
1
Vref connect bit
1 : Vref connected
A-D input group select bit
0 : Port P6 group is selected
1 : Port P5 group is selected
00
1
Note 1: Rewrite to analog input pin select bit after changing A-D operation mode.
Note 2: Set the corresponding port direction register to “0” (input mode).
When the port P5 group is selected, analog input pins are changed from AN0 to AN4 to pins AN50 to AN54.
Must be fixed to “0”
A-D sweep pin select bit (Note 2)
0 0 : AN0, AN1 (2 pins)
0 1 : AN0 to AN3 (4 pins)
1 0 : AN0 to AN5 (6 pins)
1 1 : AN0 to AN7 (8 pins)
b1 b0
Repeatedly carries out A-D conversion on pins
selected through the A-D sweep pin select bit.