Table of Contents
Advertisement
A-D CONVERTER
8.9 Repeat sweep mode 0
A-D control register 0 and A-D control register 1
b7
0
1 1
Note: Write the following registers when the A-D conversion stops (before trigger occurs).
Fig. 8.9.1 Initial setting example of repeat sweep mode 0
8–28
b0
A-D control register 0 (address 1E
Repeat sweep mode 0
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
Port P7 direction register
b7
b0
Set A-D conversion start bit to "1"
b7
1
Selecting external trigger
Input falling edge to
AD
pin
TRG
Operation start
• 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
)
16
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
b0
A-D control register 0 (address 1E
A-D conversion start bit
Selecting internal trigger
Trigger occur
A-D control register 1 (address 1F
16
A-D sweep pin select bits
b1 b0
0 0 : AN
, AN
(2 pins)
0
1
0 1 : AN
to AN
(4 pins)
0
3
1 0 : AN
to AN
(6 pins)
0
5
1 1 : AN
to AN
(8 pins)
0
7
Repeat sweep mode 0
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 1.
AD
: "0" or "1"
)
16
)
16
)
Advertisement
Table of Contents
