M16C62N Datasheet, PDF (136/213 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
(5) Repeat sweep mode 1
In repeat sweep mode 1, all pins are used for A-D conversion with emphasis on the pin or pins selected
using the A-D sweep pin select bit. Table 1.15.6 shows the specifications of repeat sweep mode 1. Figure
1.15.8 shows the A-D control register in repeat sweep mode 1.
Table 1.15.6. Repeat sweep mode 1 specifications
Item
Function
Start condition
Stop condition
Interrupt request generation timing
Input pin
Reading of result of A-D converter
Specification
All pins perform repeat A-D conversion, with emphasis on the pin or pins
selected by the A-D sweep pin select bit
Example : AN0 selected AN0 AN1 AN0 AN2 AN0 AN3, etc
Writing “1” to A-D conversion start flag
Writing “0” to A-D conversion start flag
None generated
With emphasis on these pins ; AN0 (1 pin), AN0 and AN1 (2 pins),
AN0 to AN2 (3 pins), AN0 to AN3 (4 pins) (Note)
Read A-D register corresponding to selected pin (at any time)
Note : AN00 to AN07 can be used the same as AN0 to AN7.
A-D control register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
11
Symbol
ADCON0
Address When reset
03D616 00000XXX2
Bit symbol
Bit name
CH0
Analog input pin
select bit
CH1
Function
Invalid in repeat sweep mode 1
RW
CH2
MD0
MD1
A-D operation mode
select bit 0
b4 b3
1 1 : Repeat sweep mode 1
TRG
ADST
Trigger select bit
A-D conversion start flag
0 : Software trigger
1 : ADTRG trigger
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
1
Symbol
ADCON1
Address
03D716
When reset
0016
Bit symbol
Bit name
Function
RW
SCAN0
SCAN1
A-D sweep pin select bit
When repeat sweep mode 1 is selected
b1 b0
0 0 : AN0 (1 pin)
0 1 : AN0, AN1 (2 pins)
1 0 : AN0 to AN2 (3 pins)
1 1 : AN0 to AN3 (4 pins)
(Note 2)
MD2
A-D operation mode
select bit 1
Set to “1” when this mode is selected
BITS
CKS1
8/10-bit mode select bit
Frequency select bit 1
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 (Note 3)
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: AN00 to AN07 can be used the same as AN0 to AN7.
Note 3: Neither ‘01’ nor ‘10’ can be selected with the external op-amp connection mode bit.
Figure 1.15.8. A-D conversion register in repeat sweep mode 1
135