M30222 Datasheet, PDF (162/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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Specifications in this manual are tentative and subject to change
MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
A-D Converter
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.
Table 1.52. Single sweep mode specifications
Item
Function
Start condition
Stop condition
Interrupt request
generation timing
Input pin
Reading A-D
converter results
Specification
The pin selected by the A-D sweep pin select bit are used for one-by-one A-D conversion
Writing 1 to A-D conversion start flag
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).
End of A-D conversion
AN₀ and AN₁ (2 pins), AN₀ and AN₃ (4 pins), AN₀ and AN₅ (6 pins)_,
or AN₀ and AN₁ (8 pins)
Read A-D register corresponding to selected pin
A-D control register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
10
Symbol
ADCON0
Address
03D616
When reset
00000XXX 2
Bit symbol
CH0
CH1
Bit name
Analog input pin
select bit
Function
Invalid in single sweep mode
RW
CH2
MD0
MD1
A-D operation mode
select bit 0
b4 b3
1 0 : Single sweep mode
TRG
Trigger select bit
0 : Software trigger
1 : ADTRG trigger
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 1)
b7 b6 b5 b4 b3 b2 b1 b0
1
0
Symbol
ADCON1
Address
03D716
When reset
0016
Bit symbol
Bit name
Function
RW
SCAN0
SCAN1
A-D sweep pin select bit
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)
MD2
A-D operation mode
select bit 1
0 : Any mode other than repeat sweep mode 1
BITS
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
CKS1
Frequency select bit 1
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
VCUT
Vref connect bit
1 : Vref connected
OPA0
OPA1
External op-amp
connection mode
bit (Note 2)
b7 b6
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
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.
Fig. 1.131. A-D conversion register in single sweep mode
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