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A-D control register 0 and A-D control register 1
b7
0
Fig. 8.10.2 Initial setting example of repeat sweep mode 1
b0
1 1
A-D control register 0 (address 1E
Repeat sweep mode 1
Trigger select bit
0 : Internal trigger
1 : External trigger
A-D conversion start bit
0: Stop A-D conversion
A-D conversion frequency ( φ
A-D conversion frequency ( φ
0 : f
/f
divided by 4
2
4
1 : f
/f
divided by 2
2
4
A-D conversion frequency ( φ
0 : f
/f
2
4
1 : Not selected
Port P7 direction register
b7
Set A-D conversion start bit to "1"
b7
1
Selecting external trigger
Input falling edge to
AD
pin
TRG
Note: Write the following registers when the A-D conversion stops (before trigger occurs).
• Each bit of A-D control register 0 (except bit 6)
• Each bit of A-D control register 1
7751 Group User's Manual
b7
1
)
16
) select bit 0
AD
) select bit 1 = "0"
AD
) select bit 1 = "1"
AD
b0
Port P7 direction register (address 11
AN
0
AN
1
Set the bits corresponding to
AN
2
analog input pins to "0."
AN
3
Set bit 7 to "0" when
AN
4
selecting external trigger.
AN
5
AN
6
AN
7
b0
A-D control register 0 (address 1E
A-D conversion start bit
Selecting internal trigger
Trigger occur
Operation start
A-D CONVERTER
8.10 Repeat sweep mode 1
b0
A-D control register 1 (address 1F
)
16
A-D sweep pin select bits
b1 b0
0 0 : AN
(1 pin)
0
0 1 : AN
, AN
(2 pins)
0
1
1 0 : AN
to AN
(3 pins)
0
2
1 1 : AN
to AN
(4 pins)
0
3
Repeat sweep mode 1
8/10-bit mode select bit
0 : 8-bit mode
1 : 10-bit mode
A-D conversion frequency ( φ
)
AD
select bit 1
Refer to A-D conversion frequency
(φ
) select bit 0.
AD
: "0" or "1"
)
16
)
16
8–33
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