154
Mitsubishi microcomputers
M16C / 62T Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
A-D Converter
(3) Single sweep mode
In single sweep mode, the pins selected using the A-D sweep pin select bit are used for one-by-one A-D
conversion. Table 1.20.4 shows the specifications of single sweep mode. Figure 1.20.6 shows the A-D
control register in single sweep mode.
Table 1.20.4. Single sweep mode specifications
Figure 1.20.6. A-D conversion register in single sweep mode
A-D control register 0 (Note 1)
SymbolAddressWhen reset
ADCON003D616
00000XXX2
b7b6b5b4b3b2b1b0
Analog input pin select bit
CH0
Bit symbolBit nameFunction
CH1
CH2
A-D operation mode
select bit 0
1 0 : Single sweep mode
MD0
MD1
Trigger select bit0 : Software trigger
1 : ADTRG trigger
TRG
ADST
A-D conversion start flag0 : A-D conversion disabled
1 : A-D conversion started
Frequency select bit 00 : fAD/4 is selected
1 : fAD/2 is selected
CKS0
W
R
A-D control register 1 (Note 1)
SymbolAddressWhen reset
ADCON103D716
0016
Bit nameFunction
Bit symbol
b7b6b5b4b3b2b1b0
A-D sweep pin select bit
SCAN0
SCAN1
MD2
BITS
8/10-bit mode select bit0 : 8-bit mode
1 : 10-bit mode
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 4)
W
R
1 0
Invalid in single sweep mode
0
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
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
1
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Frequency select bit 1
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
CKS1
(Note 3)
(Note 2)
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Note 2: Divide the frequency if f(XIN) exceeds 10MHz, and make
φAD frequency equal
t 10MH
Item
Specification
Function
The pins selected by the A-D sweep pin select bit are used for one-by-one A-D conversion
Start condition
Writing “1” to A-D converter 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
AN0 and AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins), or AN0 to AN7 (8 pins) (Note 1)
Reading of result of A-D converter
Read A-D register corresponding to selected pin
Note 1: AN00 to AN07, and AN20 to AN27 can be used the same as AN0 to AN7.