M30218 Datasheet, PDF (121/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

A-D converter
Mitsubishi microcomputers
M30218 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 JA-4 shows the specifications of single sweep mode. Figure JA-6 shows the A-D
control register in single sweep mode.
Table JA-4. Single sweep mode specifications
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
Stop condition
Writing “1” to A-D converter start flag
•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)
Reading of result of A-D converter Read A-D register corresponding to selected pin
A-D control register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
010
Symbol
ADCON0
Address
03D616
When reset
00000XXX2
Bit symbol
Bit name
Function
CH0
Analog input pin select bit Invalid in single sweep mode
RW
CH1
CH2
MD0
MD1
A-D operation mode
select bit 0
b4 b3
1 0 : Single sweep mode
Must always be “0”.
ADST
A-D conversion start flag 0 : A-D conversion disabled
1 : A-D conversion started
CKS0
Frequency select bit 0
0 : fAD/4 is selected
1 : fAD/2 is selected
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
A-D control register 1 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
00 1
0
Symbol
ADCON1
Address
03D716
When reset
0016
Bit symbol
SCAN0
SCAN1
MD2
BITS
CKS1
VCUT
Bit name
A-D sweep pin select bit
A-D operation mode
select bit 1
8/10-bit mode select bit
Frequency select bit 1
Vref connect bit
Function
When single sweep and repeat sweep mode 0
are selected
b1 b0
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)
0 : Any mode other than repeat sweep mode 1
0 : 8-bit mode
1 : 10-bit mode
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
1 : Vref connected
Must always be “0”.
RW
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Figure JA-6. A-D conversion register in single sweep mode
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