Mitsubishi microcomputers
M16C / 61 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
A-D Converter
122
(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. Table 1.18.5 shows the specifications of repeat sweep mode 0. Figure 1.18.7 shows the
A-D control register in repeat sweep mode 0.
Figure 1.18.7. A-D conversion register in repeat sweep mode 0
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 0
MD0
MD1
Trigger select bit
0 : Software trigger
1 : AD
TRG
trigger
0 : A-D conversion disabled
1 : A-D conversion started
TRG
ADST
A-D conversion start flag
Frequency select bit 0
0 : f
AD
/4 is selected
1 : f
AD
/2 is selected
CKS0
W
R
A-D control register 1 (Note 1)
Symbol
ADCON1
Address
03D7
16
When reset
00
16
Bit name
Function
Bit symbol
b7
b6
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
0 : f
AD
/2 or f
AD
/4 is selected
1 : f
AD
is selected
VCUT
OPA0
Vref connect bit
0 : Any mode other than repeat sweep mode 1
OPA1
A-D operation mode
select bit 1
1 : Vref connected
External op-amp
connection mode
bit (Note 2)
W
R
Invalid in repeat sweep mode 0
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Note 2: Neither “01” nor “10” can be selected with the external op-amp connection mode bit.
b4 b3
When single sweep and repeat sweep mode 0
are selected
0 0 : AN
0
, AN
1
(2 pins)
0 1 : AN
0
to AN
3
(4 pins)
1 0 : AN
0
to AN
5
(6 pins)
1 1 : AN
0
to AN
7
(8 pins)
0 0 : ANEX0 and ANEX1 are not used
0 1 : ANEX0 input is A-D converted
1 0 : ANEX1 input is A-D converted
1 1 : External op-amp connection mode
b7 b6
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Frequency select bit 1
CKS1
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
Item
Specification
Function
Start condition
Stop condition
Interrupt request generation timing
Input pin
Reading of result of A-D converter
The pins selected by the A-D sweep pin select bit are used for repeat sweep A-D conversion
Writing “1” to A-D conversion start flag
Writing “0” to A-D conversion start flag
None generated
AN
0
and AN
1
(2 pins), AN
0
to AN
3
(4 pins), AN
0
to AN
5
(6 pins), or AN
0
to AN
7
(8 pins)
Read A-D register corresponding to selected pin (at any time)
Table 1.18.5. Repeat sweep mode 0 specifications