
1-163
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
(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 1.52 shows the specifications of single sweep mode. Figure 1.131 shows the A-
D control register in single sweep mode.
Fig. 1.131. A-D conversion register in single sweep mode
Item
Specification
Function
The pin 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 conversion start flag
Stop condition
Writing 0 to A-D conversion start flag
End of A-D conversion (A-D conversion start flag changes ot 0 , except when exter-
nal trigger is selected).
Interrupt request
generation timing
End of A-D conversion
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
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
CH0
Bit symbol
Bit name
Function
CH1
CH2
A-D operation mode
select bit 0
1 0 : Single sweep mode
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 : f AD/4 is selected
1 : f AD/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
0
Invalid in single sweep mode
0
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
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
Note 2: Neither "01" nor "10" can be selected with the external op-amp connection mode bit.
Table 1.52. Single sweep mode specifications