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A-D control register 0 and A-D control register 1
b7
0
0 0
Interrupt priority level
b7
0
Port P7 direction register
b7
Fig. 8.6.1 Initial setting example of one-shot mode
b0
A-D control register 0 (address 1E
Analog input select bits
b2
b1 b0
0 0 0 : AN
selected
0
0 0 1 : AN
selected
1
0 1 0 : AN
selected
2
0 1 1 : AN
selected
3
1 0 0 : AN
selected
4
1 0 1 : AN
selected
5
1 1 0 : AN
selected
6
1 1 1 : AN
selected
7
One-shot mode
Trigger select bit
0 : Internal trigger
1 : External trigger
A-D conversion start bit
0 : Stop A-D conversion
A-D conversion frequency ( φ
) select bit 0
AD
A-D conversion frequency ( φ
) select bit 1 = "0"
AD
0 : f
/f
divided by 4
2
4
1 : f
/f
divided by 2
2
4
A-D conversion frequency ( φ
) select bit 1 = "1"
AD
0 : f
/f
2
4
1 : Not selected
b0
A-D conversion interrupt control register (address 70
Interrupt priority level select bits
Set to a level between 1 to 7 when using this interrupt.
Set to a level 0 when disabling this interrupt.
Interrupt request bit
"0" : No interrupt request
b0
Port P7 direction register (address 11
AN
0
AN
1
Set the bits corresponding
AN
2
to analog input pins to "0."
AN
3
Set bit 7 to "0" when
AN
4
selecting external trigger.
AN
5
AN
6
AN
7
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
b0
0
)
A-D control register 1 (address 1F
16
)
16
Set A-D conversion start bit to "1"
)
16
b7
1
Selecting external trigger
Input falling edge to
AD
pin
TRG
A-D CONVERTER
8.6 One-shot mode
16
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"
b0
A-D control register 0 (address 1E
A-D conversion start bit
Selecting internal trigger
Trigger occur
Operation start
)
)
16
8–17
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