m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 338

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

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