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Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
A-D Converter
194
Under
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
A-D control register 0 (Note 1)
Symbol
Address
After reset
ADCON0
03D616
00000XXX2
b7
b6
b5
b4
b3
b2
b1
b0
Analog input pin select
bit
Bit symbol
Bit name
Function
CH1
CH2
A-D operation mode
select bit 0
MD0
MD1
Trigger select bit
0 : Software trigger
1 : ADTRG trigger
TRG
ADST
A-D conversion start flag
0 : A-D conversion disabled
1 : A-D conversion started
Frequency select bit 0
CKS0
RW
0
A-D control register 1 (Note)
Symbol
Address
After 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
OPA0
Vref connect bit (Note 2)
OPA1
A-D operation mode
select bit 1
Set to “0” when one-shot mode is selected
1 : Vref connected
External op-amp
connection mode bit
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
RW
Invalid in one-shot mode
0
0 0 0 : AN0 is selected
0 0 1 : AN1 is selected
0 1 0 : AN2 is selected
0 1 1 : AN3 is selected
1 0 0 : AN4 is selected
1 0 1 : AN5 is selected
1 1 0 : AN6 is selected
(Note 2)
1 1 1 : AN7 is selected
(Note 3)
b2 b1 b0
0 0 : One-shot mode
(Note 3)
b4 b3
CH0
b7 b6
1
Frequency select bit1
CKS1
Note 1: If the ADCON0 register is rewritten during A-D conversion, the conversion result will be indeterminate.
Note 2: AN00 to AN07, and AN20 to AN27 can be used in the same way as AN0 to AN7. Use the ADCON2 register’s
ADGSEL1 to ADGSEL0 bits to select the desired pin. However, if VCC2 < VCC1, do not use AN00 to AN07 and
AN20 to AN27 as analog input pins.
Note 3: After rewriting the MD1 to MD0 bits, set the CH2 to CH0 bits over again using another instruction.
RW
See Note 3 for the ADCON2 register
Note 1: If the ADCON1 register is rewritten during A-D conversion, the conversion result will be indeterminate.
Note 2: If the VCUT bit is reset from “0” (Vref unconnected) to “1” (Vref connected), wait for 1 s or more before starting
A-D conversion.
Figure 1.22.4. ADCON0 Register and ADCON1 Register (One-shot Mode)