M30222 Datasheet, PDF (161/237 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
(2) Repeat mode
In repeat mode, the pin selected using the analog input pin select bit is used for repeated A-D conver-
sion. Table 1.51 shows the specifications of repeat mode. Figure 1.130 shows the A-D control register
in repeat mode.
Table 1.51. Repeat mode specifications
Item
Function
Start condition
Stop condition
Interrupt request
generation timing
Input pin
Reading A-D con-
verter results
Specification
The pin selected by the analog input pin select bit is used for repeated A-D conversion
Writing 1 to A-D conversion start flag
Writing 0 to A-D conversion start flag
None generated
One of AN₀ to AN₇ as selected
Read A-D register corresponding to selected pin
A-D control register 0 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
01
Symbol
ADCON0
Address
03D616
When reset
00000XXX 2
Bit symbol
Bit name
Function
RW
CH0
CH1
Analog input pin
select bit
CH2
b2 b1 b0
0 0 0 : AN0 is selected
0 0 1 : AN1 is selected
0 1 0 : AN2 is selected
0 1 1 : AN3 is selected
1 0 0 : AN4 is selected
1 0 1 : AN5 is selected
1 1 0 : AN6 is selected
1 1 1 : AN7 is selected
(Note 2)
MD0
MD1
TRG
A-D operation mode
select bit 0
Trigger select bit
b4 b3
0 1 : Repeat mode
0 : Software trigger
1 : ADTRG trigger
(Note 2)
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 1: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Note 2: When changing A-D operation mode, set analog input pin again.
A-D control register 1 (Note)
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
Invalid in repeat mode
MD2
BITS
CKS1
VCUT
A-D operation mode
select bit 1
8/10-bit mode select bit
Frequency select bit 1
Vref connect bit
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
OPA0
OPA1
External op-amp
connection mode bit
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: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Fig. 1.130. A-D conversion register in repeat mode
1-162