Renesas 7700 FAMILY User Manual page 230

A-D control register 0 and A-D control register 1
b7
0
Fig. 8.7.1 Initial setting example of repeat mode
b0
0 1 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
Repeat 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
AD
A-D conversion frequency ( φ
AD
0 : f /f divided by 4
2 4
1 : f /f divided by 2
2 4
A-D conversion frequency ( φ
AD
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 b0
) 0
16
) select bit 0
) select bit 1 = "0"
) select bit 1 = "1"
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
b0
A-D control register 0 (address 1E
A-D conversion start bit
Selecting internal trigger
Trigger occur
Operation start
A-D CONVERTER
8.7 Repeat mode
A-D control register 1 (address 1F )
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"
)
16
)
16
8–21