Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
A-D Converter
198
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
A-D control register 0 (Note)
Symbol
ADCON0
Address
03D6
16
After reset
00000XXX
2
b7
b6
b5
b4
1 0
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 0 : Single sweep mode
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
CKS0
RW
Invalid in single sweep mode
b4 b3
RW
RW
RW
RW
RW
RW
RW
RW
A-D control register 1 (Note 1)
Symbol
ADCON1
Address
03D7
16
After 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
VCUT
OPA0
Vref connect bit (Note 3)
OPA1
A-D operation mode
select bit 1
1 : Vref connected
External op-amp
connection mode
bit
When single sweep mode is selected
0 0 : AN
0
to 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)
(Note 2)
b1 b0
0 0 : ANEX0 and ANEX1 are not used
0 1 : Must not be set
1 0 : Must not be set
1 1 : External op-amp connection mode
b7 b6
Frequency select bit 1
CKS1
Set to “0” when single sweep mode is selected
RW
RW
RW
RW
RW
RW
RW
RW
RW
See Note 3 for the ADCON2 register
Note: If the ADCON0 register is rewritten during A-D conversion, the conversion result will be indeterminate.
Note 1: If the ADCON1 register is rewritten during A-D conversion, the conversion result will be indeterminate.
Note 2: AN
00
to AN
07
, and AN
20
to AN
27
can be used in the same way as AN
0
to AN
7
. Use the ADCON2 register’s
ADGSEL1 to ADGSEL0 bits to select the desired pin. However, if V
CC2
< V
CC1
, do not use AN
00
to AN
07
and
AN
20
to AN
27
as analog input pins.
Note 3: If the VCUT bit is reset from “0” (Vref unconnected) to “1” (Vref connected), wait for 1 μs or more before starting
A-D conversion.
See Note 3 for the ADCON2 register
Figure 1.22.6. ADCON0 Register and ADCON1 Register (Single Sweep Mode)