Unde
deeopmen
Preliminary Specifications REV.E
Specifications in this manual are tentative and subject to change.
A-D Converter
Mitsubishi microcomputers
M30220 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
134
(1) One-shot mode
In one-shot mode, the pin selected using the analog input pin select bit is used for one-shot A-D conver-
sion. Table 1.17.2 shows the specifications of one-shot mode. Figure 1.17.4 shows the A-D control regis-
ter in one-shot mode.
Table 1.17.2. One-shot mode specifications
Item
Function
The pin selected by the analog input pin select bit is used for one A-D conversion
Start condition
Writing “1” to A-D conversion start flag
Stop condition
End of A-D conversion (A-D conversion start flag changes to “0”, except
when external trigger is selected)
Writing “0” to A-D conversion start flag
Interrupt request generation timing
End of A-D conversion
Input pin
One of AN
0
to AN
7
, as selected
Reading of result of A-D converter
Read A-D register corresponding to selected pin
Figure 1.17.4. A-D conversion register in one-shot mode
A-D control register 0 (Note 1)
Symbol
ADCON0
Address
03D6
16
When reset
00000XXX
2
b7
b6
b5
b4
0
b3
0
b2
b1
b0
Analog input pin select
bit
Bit symbol
Bit name
Function
CH1
CH2
A-D operation mode
select bit 0
Trigger select bit
MD0
MD1
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
b6
0
b5
1
b4
b3
b2
0
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
A-D operation mode
select bit 1
0 : Any mode other than repeat sweep
mode 1
1 : Vref connected
W
R
Invalid in one-shot mode
0 0 0 : AN
0
is selected
0 0 1 : AN
1
is selected
0 1 0 : AN
2
is selected
0 1 1 : AN
3
is selected
1 0 0 : AN
4
is selected
1 0 1 : AN
5
is selected
1 1 0 : AN
6
is selected
1 1 1 : AN
7
is selected
(Note 2)
b2 b1 b0
(Note 2)
b4 b3
CH0
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Note 2: When changing A-D operation mode, set analog input pin again.
Frequency select bit1
0 : f
AD
/2 or f
AD
/4 is selected
1 : f
AD
is selected
CKS1
Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
A
A
A
A
A
A
A
A
A
A
A
A
A
Always set to “0”.
Specification