
1-114
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Preliminary Specifications REV. E
Specifications in this manual are tentative and subject to change
A-D Converter
2.24.5 Repeat sweep mode 1
In repeat sweep mode 1, all pins are used for A-D conversion with emphasis on the pin or pins select-
ed using the A-D sweep pin select bit. Table 1.36 shows the specifications of repeat sweep mode 1.
Figure 1.104 show the A-D control in repeat sweep mode 1.
Table 1.36:
Repeat sweep mode 1 specification
Figure 1.104: A-D conversion register in repeat sweep mode 1
Item
Specification
Function
All pins perform repeat sweep A-D conversion, with emphasis on the pin or
pins selected by the A-D sweep pin select bit
Example: AN0 selected AN0 AN1 AN0 AN2 AN0 AN3, etc.
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 (1 pin), AN0 and AN1 (2 pins), AN0 to AN2 (3 pins), AN0 to AN3 (4 pins)
Reading of result of A-D converter
Read A-D register corresponding to selected pin (at any time)
A-D control register 0 (Note)
Symbol
ADCON0
Address
03D6
16
When reset
00000XXX
2
b7
b6
b5
b4
1 1
b3
b2
b1
b0
Analog input pin
select bit
CH0
Bit symbol
Bit name
Function
CH1
CH2
A-D operation mode
select bit 0
1 1 : Repeat sweep mode 1
MD0
MD1
Trigger select bit
0 : Software trigger
1 : AD
TRG
trigger
0 : A-D conversion disabled
1 : A-D conversion started
0 : f
AD
/4 is selected
1 : f
AD
/2 is selected
TRG
ADST
A-D conversion start flag
Frequency select bit 0
CKS0
W
R
A-D control register 1 (Note)
Symbol
ADCON1
Address
03D7
16
When reset
00
16
Bit name
Function
Bit symbol
b7
0 0
b6
b5
1
b4
b3
b2
1
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
0 : f
AD
/2 or f
AD
/4 is selected
1 : f
AD
is selected
VCUT
Vref connect bit
1 : Repeat sweep mode 1
A-D operation mode
select bit 1
1 : Vref connected
W
R
Invalid in repeat sweep mode 1
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
b4 b3
When repeat sweep mode 1 is selected
0 0 : AN
0
(1 pin)
0 1 : AN
0
, AN
1
(2 pins)
1 0 : AN
0
to AN
2
(3 pins)
1 1 : AN
0
to AN
3
(4 pins)
b1 b0
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Frequency select bit 1
CKS1
Reserved bit
Always set to "0
"