Renesas M16C Series User Manual

A-D Converter
M30240 Group
Rev.1.00 Sep 24, 2003 Page 239 of 360
2.6.2.4 Single-sweep mode
In single-sweep mode, select functions from those listed in Table 2.30 . An example using the indicated
options is described below. Figure 2.85 shows the timing chart, and Figure 2.86 shows the set-up
procedure.
Table 2.30: A-D converter in single-sweep mode functions
Operation
(1) Setting the A-D conversion start flag to “1” causes the A-D converter to start the conversion on the
voltage input to the AN
0
pin.
(2) After the A-D conversion of voltage input to the AN
0
pin is completed, the content of the successive
comparison register (conversion result) is transmitted to A-D register 0. The A-D converter converts
all analog input pins selected by the user. The conversion result is transmitted to A-D register i corre-
sponding to each pin, every time conversion on one pin is completed.
(3) When the A-D conversion on all the analog input pins selected is completed, the A-D conversion
interrupt request bit goes to “1”. At this time, the A-D conversion start flag goes to “0”. The A-D con-
verter stops operating.
Figure 2.85: Operation timing of single sweep mode
Item
Set-up Item Set-up
Operation clock AD O
Divided-by-4 fAD/ divided-by-2
fAD/fAD
Trigger for starting A-D
conversion
O Software trigger
Resolution O 8-bit / 10-bit Trigger by AD
TRG
Analog input pin O
AN
0
pin and AN
1
(2 pins) / AN
0
to AN
3
(4 pins) / AN
0
to AN
5
(6
pins) / AN
0
to AN
7
(8 pins)
Sample & Hold
Not activated
O Activated
Cleared to “0” when interrupt request is accepted, or cleared by software
A-D conversion
start flag
“1”
“0”
A-D register 0
A-D register 1
φAD
A-D register i
Result
Result
Result
Set to “1” by software
8-bit resolution : 28 φAD cycles
10-bit resolution : 33
φAD cycles
8-bit resolution : 28
φAD cycles
10-bit resolution : 33
φAD cycles
(1) Start A-D conversion
After A-D conversion on AN0 pin is complete,
A-D converter begins converting all pins selected
A-D conversion
is complete
(2)
(3)
A-D conversion
interrupt request
bit
“1”
“0”

Renesas M16C Series Specifications

General

Brand	Renesas
Model	M16C Series
Category	Computer Hardware
Language	English