M16C62_M Datasheet, PDF (173/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

A-D Converter
Mitsubishi microcomputers
M16C / 62A Group
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 conversion.
Table 1.17.3 shows the specifications of repeat mode. Figure 1.17.5 shows the A-D control register in
repeat mode.
Table 1.17.3. Repeat mode specifications
Item
Function
Star condition
Stop condition
Interrupt request generation timing
Input pin
Reading of result of A-D converter
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 (at any time)
A-D control register 0 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
01
Symbol
ADCON0
Address
03D616
When reset
00000XXX2
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
ADST
A-D operation mode
select bit 0
Trigger select bit
A-D conversion start flag
b4 b3
0 1 : Repeat mode
0 : Software trigger
1 : ADTRG trigger
0 : A-D conversion disabled
1 : A-D conversion started
(Note 2)
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
Set to “0” when this mode is selected
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.
Figure 1.17.5. A-D conversion register in repeat mode
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