
A-D Converter
M30240 Group
Rev.1.00 Sep 24, 2003 Page 104 of 360
1.2.24.2 Repeat mode
In repeat mode, the pin selected using the analog input pin select bit is used for repeated A-D conver-
in repeat mode.
Figure 1.100: A-D conversion register in repeat mode
Table 1.32:
Repeat mode specification
Item
Specification
Function
The pin selected by the analog input pin select bit is used for repeated A-D
Star 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
One of AN0 to AN7, as selected
Reading of result of A-D converter
Read A-D register corresponding to selected pin
A-D control register 0 (Note 1)
Symbol
Address
When reset
ADCON0
03D616
00000XXX2
b7
b6
b5
b4
b3
b2
b1
b0
Analog input pin
select bit
CH0
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
0 : fAD/4 is selected
1 : fAD/2 is selected
CKS0
W
R
A-D control register 1 (Note)
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 bit
SCAN0
SCAN1
MD2
BITS
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
VCUT
Vref connect bit
A-D operation mode
select bit 1
1 : Vref connected
W
R
01
Invalid in repeat mode
0
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)
b2 b1 b0
0 1 : Repeat mode
(Note 2)
b4 b3
1
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.
Frequency select bit 1
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
CKS1
0 : Any mode other than repeat sweep mode 1
Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Reserved bit
Always set to "0"
0 0
A-D control register 0 (Note 1)
Symbol
Address
When reset
ADCON0
03D616
00000XXX2
b7
b6
b5
b4
b3
b2
b1
b0
Analog input pin
select bit
CH0
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
0 : fAD/4 is selected
1 : fAD/2 is selected
CKS0
W
R
A-D control register 1 (Note)
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 bit
SCAN0
SCAN1
MD2
BITS
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
VCUT
Vref connect bit
A-D operation mode
select bit 1
1 : Vref connected
W
R
01
Invalid in repeat mode
0
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)
b2 b1 b0
0 1 : Repeat mode
(Note 2)
b4 b3
1
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.
Frequency select bit 1
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
CKS1
0 : Any mode other than repeat sweep mode 1
Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Reserved bit
Always set to "0"
0 0