A-D Converter
154
Mitsubishi microcomputers
M16C / 62N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Figure 1.18.2. A-D converter-related registers (1)
A-D control register 0 (Note 1)
Symbol
Address
When reset
ADCON0
03D616
00000XXX2
b7
b6
b5
b4
b3
b2
b1
b0
Analog input pin select bit
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)
CH0
Bit symbol
Bit name
Function
CH1
CH2
A-D operation mode
select bit 0
0 0 : One-shot mode
0 1 : Repeat mode
1 0 : Single sweep mode
1 1 : Repeat sweep mode 0
Repeat sweep mode 1
(Note 3)
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
0 : fAD/4 is selected
1 : fAD/2 is selected
CKS0
W
R
A-D control register 1 (Note 1)
Symbol
Address
When 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
OPA1
A-D operation mode
select bit 1
0 : Any mode other than repeat sweep
mode 1
1 : Repeat sweep mode 1
0 : Vref not connected
1 : Vref connected
External op-amp
connection mode bit
W
R
b2 b1 b0
b4 b3
When single sweep and repeat sweep
mode 0 are selected
0 0 : AN0, AN1 (2 pins)
0 1 : AN0 to AN3 (4 pins)
1 0 : AN0 to AN5 (6 pins)
1 1 : AN0 to AN7 (8 pins)
b1 b0
When repeat sweep mode 1 is selected
0 0 : AN0 (1 pin)
0 1 : AN0, AN1 (2 pins)
1 0 : AN0 to AN2 (3 pins)
1 1 : AN0 to AN3 (4 pins)
(Note 2)
b1 b0
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 1: If the A-D control register is rewritten during A-D conversion, the conversion result is
indeterminate.
Note 2: AN00 to AN07 can be used the same as AN0 to AN7.
Note 3: When changing A-D operation mode, set analog input pin again.
Frequency select bit 1
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
CKS1
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result is
indeterminate.
Note 2: AN00 to AN07 can be used the same as AN0 to AN7.