A-D CONVERTER
12.7 One-shot mode
12.7 One-shot mode
In the one-shot mode, the operation for an input voltage from one selected analog input pin is performed
once, and an A-D conversion interrupt request occurs at completion of the operation.
12.7.1 Settings for one-shot mode
Figures 12.7.1 and 12.7.2 show initial setting examples for related registers in the one-shot mode.
When using an interrupt, it is necessary to set the related registers to enable an interrupt. Refer to
“CHAPTER 6. INTERRUPTS” for more details.
A-D control registers 0 and 1
b7
b0
b7
b0
A-D control register 0
(Address 1E16
A-D control register 1
(Address 1F16
0 0
0
X
X
0
0 0 0
)
)
Analog input pin select bits
b2 b1 b0
Resolution select bit
0 : 8-bit resolution mode
1 : 10-bit resolution mode
0 0 0 : AN
0 0 1 : AN
0 1 0 : AN
0 1 1 : AN
1 0 0 : AN
0
1
2
3
4
selected
selected
selected
selected
selected
A-D conversion frequency (φAD) select bit 1
See Table 12.2.1.
V
REF connection select bit
0 : Pin VREF is connected.
One-shot mode
A-D conversion start bit
0 : A-D conversion halts.
A-D conversion frequency (φAD) select bit 0
X : It may be either “0” or “1.”
See Table 12.2.1.
Selection of comparator function
b7
b0
Comparator function select register 0 (Address DC16
)
0
0 0
AN0
AN1
AN2
AN3
AN4
0 : Comparator function is not .selected
1 : Comparator function is selected.
When comparator function is not selected
When comparator function is selected
A-D register i
A-D register 0 (Addresses 2116, 2016
)
)
)
)
)
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
(b8)
b0
(b15)
b7
b7
b0
A value (comparison value) in the range
from 0016 through FF16 is set.
Continued on Figure 12.7.2.
Fig. 12.7.1 Initial setting example for related registers in one-shot mode (1)
7906 Group User’s Manual Rev.2.0
12-19
RENESAS [ RENESAS TECHNOLOGY CORP ]
