
1-164
Under
development
Specifications in this manual are tentative and subject to change
Rev. H
A-D Converter
MITSUBISHI MICROCOMPUTERS
M30222 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(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 1.53 shows the specifications of repeat sweep mode 0. Figure 1.132
shows the A-D control register in repeat sweep mode 0.
Table 1.53. Repeat sweep mode 0 specifications
Fig. 1.132. A-D conversion register in repeat sweep mode 0
Item
Specification
Function
The pin 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 and AN3 (4 pins), AN0 and AN5 (6 pins),
or AN0 and AN1 (8 pins)
Reading A-D
converter results
Read A-D register corresponding to selected pin (at any time)
A-D control register 0 (Note)
Symbol
Address
When reset
ADCON0
03D616
00000XXX 2
b7
b6
b5
b4
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 1 : Repeat sweep mode 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
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
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 2)
W
R
1 1
Invalid in repeat sweep mode 0
0
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Note 2: Neither “01” nor “10” can be selected with the external op-amp connection mode bit.
b4 b3
When single sweep and repeat sweep mode 0
are selected
0 0 : AN 0, AN1 (2 pins)
0 1 : AN 0 to AN3 (4 pins)
1 0 : AN 0 to AN5 (6 pins)
1 1 : AN 0 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: 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