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Page 172
21. A/D Converter
p
u
o
r
G
0
8
/
C
6
1
M
(3) Single sweep mode
In single sweep mode, the pins selected using the A/D sweep pin select bit are used for one-by-one A/D
conversion. Table 21.4 shows the specifications of single sweep mode. Figure 21.6 shows the A/D con-
trol register in single sweep mode.
Table 21.4 Single sweep mode specifications
Figure 21.6 A/D conversion register in single sweep mode
A/D control register 0 (Note)
Symbol
Address
When reset
ADCON0
039616
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
1 0 : Single sweep mode
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 1)
Symbol
Address
When reset
ADCON1
039716
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
0 : Any mode other than repeat sweep mode 1
OPA1
A/D operation mode
select bit 1
1 : Vref connected
External op-amp
connection mode
bit (Note 2)
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.
Note 2: Neither ‘01’ nor ‘10’ can be selected with the external op-amp connection mode bit.
Note 3: When f(XIN) is over 10 MHz, the fAD frequency must be under 10 MHz by dividing.
Note 4: Set "0" to PSL3_5 and PSL3_6 of the function select register B3.
Note 5: Set "1" to PSL3_5 of the function select register B3.
Note 6: Set "1" to PSL3_6 of the function select register B3.
Note 7: Set "1" to PSL3_5 and PSL3_6 of the function select register B3.
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
b7 b6
1
Note: If the A/D control register is rewritten during A/D conversion, the conversion result is indeterminate.
0 : fAD/2 or fAD/4 is selected
1 : fAD is selected
CKS1
Frequency select bit 1
(Note 3)
0 0 : ANEX0 and ANEX1 are not used(Note 4)
0 1 : ANEX0 input is A/D converted(Note 5)
1 0 : ANEX1 input is A/D converted(Note 6)
1 1 : External op-amp connection mode(Note 7)
Item
Specification
Function
The pins selected by the A/D sweep pin select bit 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 register corresponding to selected pin