A-D Converter
Mitsubishi microcomputers
M16C / 6N0 / 6N1 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
164
(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 1.17.5 shows the specifications of repeat sweep mode 0. Figure 1.17.7 shows the
A-D control register in repeat sweep mode 0.
Table 1.17.5. Repeat sweep mode 0 specifications
Figure 1.17.7. A-D conversion register in repeat sweep mode 0
A-D control register 0 (Note)
Symbol
Address
When 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
W
R
1
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 (Note 2)
When single sweep and repeat sweep mode
0 are selected:
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 : Set to "0" when this mode is selected
1 : VREF connected
External op-amp
connection mode bit
(Note 4)
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
1 0 : AN0 to AN5 (6 pins)
1 1 : AN0 to AN7 (8 pins)
0 1 : AN0 to AN3 (4 pins)
0 0 : AN0, AN1 (2 pins)
W
R
Invalid in repeat sweep mode 0
0
1 1 : Repeat sweep mode 0
b4 b3
CH0
b7 b6
b1 b0
1
Frequency select bit1
(Note 3)
0 : f2AD/2 or f2AD/4 is selected
CKS1
1 : f2AD is selected
0 : f2AD/4 is selected
1 : f2AD/2 is selected
Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Note 2: AN00 to AN07 and AN20 to AN27 can be used in the same way as AN0 to AN7.
Note 3: Divide the frequency if f(XIN) exceeds 10MHz, and make AD frequency
equal to or less than 10MHz.
Note 4: Neither "01" nor "10" can be selected with the external op-amp connection
mode bit.
Item
Specification
Function
The pins selected by the A-D sweep pin select bit are used for repeat sweep A-D conversion.
Start condition
Writing "1" to A-D conversion start flag
Stop condition
Writing "0" to A-D conversion start flag
Interrupt request
generation timing
None generated
Input pin
AN0 and AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins), or AN0 to AN7 (8 pins)
Reading of result of A-D
converter
Read A-D register corresponding to selected pin (at any time)