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Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
A-D Converter
96
(4) Repeat sweep mode 0
In repeat sweep mode 0, the pins selected using the A-D sweep pin select bit are used for repeat sweep
A-D conversion. (See Table 1.33.) Figure 1.88 shows the A-D control register in repeat sweep mode 0.
Figure 1.88. A-D conversion register in repeat sweep mode 0
Item
Specification
Function
The pins selected by the A-D sweep pin select bit are used for repeat sweep A-D conversion
Start condition
Writing “1” to A-D conversion start flag
Stop condition
Writing “0” to A-D conversion start flag
Interrupt request generation timing
None generated
Input pin
AN0 and AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins), or AN0 to AN7 (8 pins)(Note)
Reading of result of A-D converter
Read A-D register corresponding to selected pin (at any time)
Table 1.33. Repeat sweep mode 0 specifications
Note : AN50 to AN54 can be used in the same way as for AN0 to AN4.
A-D control register 0 (Note)
Symbol
Address
When reset
ADCON0
03D616
00000XXX2
b7
b6
b5
b4
b3 b2
b1 b0
Analog input pin select bit
Invalid in repeat sweep mode 0
CH0
Bit symbol
Bit name
Function
CH1
CH2
A-D operation mode
select bit 0
1 1 : Repeat sweep mode 0
MD0
MD1
ADST
A-D conversion start flag
0 : A-D conversion disabled
1 : A-D conversion started
Frequency select bit 0
0 : fAD/4 is selected
1 : fAD/2 is selected
CKS0
W
R
A-D control register 1 (Note 1)
Symbol
Address
When reset
ADCON1
03D716
0016
Bit name
Function
Bit 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
ADGSEL0
A-D operation mode
select bit 1
1 : Vref connected
A-D input group select bit
W
R
b4 b3
0 : Port P6 group is selected
1 : Port P5 group is selected
Note: If the A-D control register is rewritten during A-D conversion, the conversion result is
indeterminate.
Frequency select bit 1
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
CKS1
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result is
indeterminate.
Note 2: AN50 to AN54 can be used in the same way as for AN0 to AN4.
Note 3: If port P5 group is selected, the contents of A-D registers 5 to 7 are indeterminate.
If port P5 group is selected, do not select 8 pins sweep mode.
0
Set this bit to “0”.
0
Set this bit to “0”.
11
0
1
When single sweep and repeat sweep
mode 0 are selected
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
(Note 2, 3)
Set this bit to “0” in this mode.