A-D CONVERTER
12.11 Repeat sweep mode 1
Continued from preceding Figure 12.11.2.
When comparator function is not selected
When comparator function is selected
A-D register j
(b 8)
b0
(b 15)
b7
A-D register 0 (Addresses 2116, 2016
)
)
)
)
)
b7
b0
A-D register 1 (Addresses 2316, 2216
A-D register 2 (Addresses 2516, 2416
A-D register 3 (Addresses 2716, 2616
A-D register 4 (Addresses 2916, 2816
A-D register 5 (Addresses 2B16, 2A16
A-D register 6 (Addresses 2D16, 2C16
A-D register 7 (Addresses 2F16, 2E16
)
)
)
A value (comparison value) in the range
from 0016 through FF16 is set.
Port P7 direction register
b7
b0
Port P7 direction register
(Address 1116
)
AN
AN
AN
AN
AN
AN
AN
AN
0
Clear the bits, corresponding to the
selected analog input pins, to “0.”
1
2
3
4
5
6
7
Setting of A-D conversion start bit to “1.”
b7
b0
A-D control register 0
(Address 1E16
1
)
A-D conversion start bit
Trigger generated
Operation starts.
Note: Writing to the following must be performed while the A-D converter
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 wrinting 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 j (when the comparator function is selected)
• Comparator function select register 0
Especially, when the VREF connection select bit is cleared from “1” to “0,”
an interval of 1 µs or more must be elapsed before occurrence of a trigger.
Fig. 12.11.3 Initial setting example for related registers in repeat sweep mode 1 (2)
7905 Group User’s Manual Rev.1.0
12-38
RENESAS [ RENESAS TECHNOLOGY CORP ]
