m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 338
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m37905
Manufacturer Part Number
m37905
Description
Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M37905.pdf
(565 pages)
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Fig. 12.8.2 Initial setting example for related registers in repeat mode (2)
Selection of comparator function
b7
Port P7, P8 direction register
b7
When comparator function is selected
(b 15 )
b0
b7
A-D register i
AN
AN
AN
AN
AN
AN
AN
AN
Comparator function select register 0
(Address DC
0
1
2
3
4
5
6
7
b0
Note: Writing to the following must be performed while the A-D converter
AN
AN
AN
AN
AN
AN
AN
AN
0 : Comparator function is not selected
1 : Comparator function is selected.
0
1
2
3
4
5
6
7
Port P7 direction register
(Address 11
halts (in other words, before a trigger is generated); this must be done
independent of the operation mode of the A-D converter.
• Each bit of the A-D control register 0, except writing of ”0” to bit 6
• Each bit of the A-D control register 1
• Each bit of the A-D control register 2
• A-D register i (when the comparator function is selected)
• Comparator function select register 0
• Comparator function select register 1
Especially, when the V
an interval of 1 s or more must be elapsed before occurrence of a trigger.
Clear the bits, corresponding to the
selected analog input pins, to “0.”
Setting of A-D conversion start bit to “1.”
b7
16
)
1
Continued from preceding Figure 12.8.1.
(b 8)
b0 b7
16
7905 Group User’s Manual Rev.1.0
)
Operation starts.
Trigger generated
REF
connection select bit is cleared from “1” to “0,”
b0
A-D conversion start bit
A-D control register 0
(Address 1E
b7
b0
b7
0 0
A value (comparison value) in the range
from 00
A-D register 0 (Addresses 21
A-D register 1 (Addresses 23
A-D register 2 (Addresses 25
A-D register 3 (Addresses 27
A-D register 4 (Addresses 29
A-D register 5 (Addresses 2B
A-D register 6 (Addresses 2D
A-D register 7 (Addresses 2F
A-D register 8 (Addresses E1
A-D register 9 (Addresses E3
A-D register 10 (Addresses E5
A-D register 11 (Addresses E7
0
16
16
)
0
through FF
When comparator function is not selected
b0
16
b0
AN
AN
AN
AN
is set.
8
9
10
11
AN
AN
AN
AN
Port P8 direction register
(Address 14
Comparator function select register 0
(Address DD
A-D CONVERTER
8
9
10
11
Clear the bits, corresponding to the
selected analog input pins, to “0.”
16
16
16
16
16
0 : Comparator function is not selected
1 : Comparator function is selected.
16
16
16
16
16
16
16
, 20
, 22
, 24
, 26
, 28
, 2E
, 2A
, 2C
, E0
, E2
, E4
, E6
16
16
16
16
16
16
16
16
16
16
16
16
16
)
)
)
)
)
)
)
)
)
)
)
)
16
)
)
12.8 Repeat mode
12-27
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