M16C62N Datasheet, PDF (132/213 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

A-D Converter
Mitsubishi microcomputers
M16C / 62N Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(1) One-shot mode
In one-shot mode, the pin selected using the analog input pin select bit is used for one-shot A-D conver-
sion. Table 1.15.2 shows the specifications of one-shot mode. Figure 1.15.4 shows the A-D control regis-
ter in one-shot mode.
Table 1.15.2. One-shot mode specifications
Item
Specification
Function
The pin selected by the analog input pin select bit is used for one A-D conversion
Start condition
Writing “1” to A-D conversion start flag
Stop condition
• 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
One of AN0 to AN7, as selected (Note)
Reading of result of A-D converter Read A-D register corresponding to selected pin
Note : AN00 to AN07 can be used the same as AN0 to AN7.
A-D control register 0 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
ADCON0
Address When reset
03D616 00000XXX2
Bit symbol
Bit name
Function
RW
CH0
CH1
CH2
MD0
MD1
TRG
Analog input pin select
bit
A-D operation mode
select bit 0
Trigger select bit
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
b4 b3
0 0 : One-shot mode
0 : Software trigger
1 : ADTRG trigger
(Note 2)
(Note 3)
(Note 3)
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: AN00 to AN07 can be used the same as AN0 to AN7.
Note 3: 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
SCAN0
SCAN1
A-D sweep pin
select bit
Function
Invalid in one-shot mode
RW
MD2
BITS
CKS1
A-D operation mode
select bit 1
8/10-bit mode select bit
Frequency select bit1
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
VCUT Vref connect bit
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 1.15.4. A-D conversion register in one-shot mode
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