
A-D Converter
Rev.1.00
Jun 06, 2003
page 137 of 290
M16C/6K9 Group
(3) Single sweep mode
In single sweep mode, the pins selected using the A-D sweep pin selection bits are used for one-by-one A-
D conversion. Table.JA-4 shows the specifications of single sweep mode. Fig.JA-6 shows the A-D control
register in single sweep mode.
Table.JA-4 Single sweep mode specifications
Fig.JA-6 A-D conversion register in single sweep mode
Item
Specification
Function
The pins selected by the A-D sweep pin selection bits are used for one-by-one A-D conversion
Start condition
Writing “1” to A-D converter 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
AN0 and AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins), or AN0 to AN7 (8 pins)
Reading of result of A-D converter
Read A-D registers corresponding to selected pins
A-D control register 0 (Note)
Symbol
Address
When reset
ADCON0
03D616
00000XXX2
b7
b6
b5
b4
b3
b2
b1
b0
Analog input pin selection bits
CH0
Bit symbol
Bit name
Function
CH1
CH2
A-D operation mode selection
bits 0
1 0 : Single sweep mode
MD0
MD1
Trigger selection bit
0 : Software trigger
1 : ADTRG trigger
TRG
ADST
A-D conversion start flag
0 : A-D conversion disabled
1 : A-D conversion started
W
R
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 bit
SCAN0
SCAN1
MD2
BITS
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
VCUT
OPA0
Vref connect bit
Should be "0" in this mode
OPA1
A-D operation mode
select bit 1
1 : Vref connected
W
R
1 0
Invalid in single sweep mode
0
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
b4 b3
When single sweep and repeat sweep mode 0
are selected
0 0 : AN0, AN1 (2 pins)
0 1 : AN0 to AN3 (4 pins)
1 0 : AN0 to AN5 (6 pins)
1 1 : AN0 to AN7 (8 pins)
b1 b0
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 : Inhibited
b7 b6
1
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
ANEX0,1 selection bis
CKS0
Frequency selection bit 0
0 : FAD/4 selected
1 : FAD/2 selected
CKS1
Frequency selection bit 1
0 : FAD/2 or FAD/4 selected
1 : FAD selected