A-D Converter
Mitsubishi microcomputers
M16C / 6N0 / 6N1 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
165
(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 1.17.6 shows the specifications of repeat sweep mode 1. Figure
1.17.8 shows the A-D control register in repeat sweep mode 1.
Table 1.17.6. Repeat sweep mode 1 specifications
Figure 1.17.8. A-D conversion register in repeat sweep mode 1
Item
Specification
Function
All pins perform repeat sweep 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
Start condition
Writing "1" to A-D conversion start flag
Stop condition
Writing "0" to A-D conversion start flag
Interrupt request
generation timing
None generated
Input pin
With emphasis on these pins; AN0 (1 pin), AN0 and AN1 (2 pins), AN0 to AN2 (3 pins), AN0 to AN3 (4 pins)
Reading of result of A-D
converter
Read A-D register corresponding to selected pin (at any time)
A-D control register 1 (Note 1)
Symbol
Address
When reset
ADCON1
03D716
0016
Bit name
Function
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
A-D sweep pin
select bits (Note 2)
When repeat sweep mode 1 is selected:
SCAN0
SCAN1
MD2
BITS
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
VCUT
OPA0
VREF connect bit
OPA1
A-D operation mode
select bit 1
1 : Set to "1" when this mode is selected
1 : VREF connected
External op-amp
connection mode bits
(Note 4)
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
1 0 : AN0 to AN2 (3 pins)
1 1 : AN0 to AN3 (4 pins)
0 1 : AN0, AN1 (2 pins)
0 0 : AN0 (1 pin)
W
R
1
b7 b6
b1 b0
1
Frequency select bit1
(Note 3)
0 : f2AD/2 or f2AD/4 is selected
CKS1
1 : f2AD is selected
A-D control register 0 (Note)
Symbol
Address
When reset
ADCON0
03D616
00000XXX2
b7
b6
b5
b4
b3
b2
b1
b0
Analog input pin select
bits
Bit symbol
Bit name
Function
CH1
CH2
A-D operation mode
select bit 0
MD0
MD1
Trigger select bit
0 : Software trigger
1 : ADTRG trigger
TRG
ADST
A-D conversion start flag
0 : A-D conversion disabled
1 : A-D conversion started
Frequency select bit 0
CKS0
W
R
1
Invalid in repeat sweep mode 1
1 1 : Repeat sweep mode 1
b4 b3
CH0
0 : f2AD/4 is selected
1 : f2AD/2 is selected
Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Note 2: AN00 to AN07 and AN20 to AN27 can be used in the same way as AN0 to AN7.
Note 3: Divide the frequency if f(XIN) exceeds 10MHz, and make AD frequency
equal to or less than 10MHz.
Note 4: Neither "01" nor "10" can be selected with the external op-amp connection
mode bit.