m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 400

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

Fig. 18.1.1 Application example of A-D converter, using single sweep mode with pins AN
b7
0 0
Selection of comparator function
b7
0 0 0 0 0 0 0 0
Port P7 direction register, Port P8 direction register
b7
b7
0 0 0 0 0 0 0 0
0
Setting of A-D conversion start bit to “0.”
b7
0
0
0 0 0 0
0 0 0 0
b0
b0
AN
AN
AN
AN
b0
b0
AN
AN
AN
AN
AN
AN
AN
AN
Comparator function select register 0
(Address DC
Comparator function select register 1
(Address DD
8
9
10
11
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
0
1
2
3
4
5
6
7
b0
Port P7 direction register
(Address 11
Port P8 direction register
(Address 14
0 : Comparator function is not selected.
0
1
2
3
4
5
6
7
8
9
10
11
0 : Comparator function is not selected.
A-D conversion halts.
A-D control register 0
(Address 1E
Clear the bits, corresponding to the
selected analog input pins, to “0.”
Clear the bits, corresponding to the
selected analog input pins, to “0.”
16
16
16
16
)
)
)
)
16
)
7905 Group User’s Manual Rev.1.0
18.1 Application example of A-D converter
Interrupt disabled, no interrupt requested
b7
Setting of pins AN
b7
b7
b7
0 0
Setting of A-D conversion start bit to “1.”
b7
0
0
0: During A-D
1
0
conversion.
0
0
0
1 0
0
0 0 0
1
0
Continued on Figure 18.1.2.
0
0
to AN
b0
1 1
Interrupt disabled
No interrupt requested
A-D conversion interrupt control register
(Address 70
interrupt request
A-D conversion
b0
b0
b0
7
APPLICATIONS
to single sweep mode
A-D conversion frequency ( AD
A-D conversion start bit
b0
bit = “1” ?
Single sweep mode
Analog input pin select bits 1
See Table 12.2.1.
A-D control register 0
(Address 1E
0 : A-D conversion halts.
A-D control register 1
(Address 1F
A-D conversion frequency ( AD
A-D sweep pin select bits
Resolution select bit
V
A-D control register 2
(Address DB
b3
0
A-D conversion starts.
A-D control register 0
(Address 1E
REF
See Table 12.2.1.
1 : 10-bit resolution mode
b1 b0
0 : Pin V
1 1 : AN
b2
Trigger generated, A-D conversion started
1: A-D conversion, using single sweep mode
b1 b0
connection select bit
with pins AN
16
: Pins AN
)
: It may be either “0” or “1.”
REF
0
to AN
16
16
is connected.
16
16
)
)
)
0
)
7
0
to AN
(8 pins)
to AN
7
7
are selected.
, is completed.
) select bit 0
)
select bit 1
0
to AN
11
18-3
(1)