m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 332
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m37905
Manufacturer Part Number
m37905
Description
Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M37905.pdf
(565 pages)
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bit successive approximation register are treated as the A-D conversion result. Accordingly, when compared
with the 8-bit A-D converter, a comparison reference voltage is different by 3V
underlined portions in Table 12.5.1). The difference of the output code change point is generated as shown
in Figure 12.5.1.
V
n : Contents of successive approximation register
12.5 Comparison voltage in 8-bit resolution mode
In the 8-bit resolution mode, which is selected by the resolution select bit, the high-order 8 bits of the 10-
Table 12.5.1 Comparison voltage
Fig. 12.5.1 Difference of output code change point
REF
Comparison voltage
: Reference voltage
V
ref
M37905’s A-D converter’s ideal characteristics (when V
8-bit A-D converter’s ideal characteristics (when V
(A-D conversion result)
(A-D conversion result)
resolution
mode
8-bit
02
01
00
Note :
V
REF
Output code
Output code
: Reference voltage
Difference of output code change point
resolution
10-bit
mode
M37905’s 8-bit resolution mode
09
08
07
06
05
04
03
02
01
00
V
2
02
01
00
REF
8
7905 Group User’s Manual Rev.1.0
n –
12.5 Comparison voltage in 8-bit resolution mode
10
V
2
REF
10
17.5
(Note)
0.5
30
37.5
(Note)
REF
Analog input voltage (mV)
Analog input voltage (mV)
8-bit resolution mode
= 5.12 V)
10-bit resolution mode
A-D CONVERTER
REF
V
2
REF
8-bit A-D converter
8
= 5.12 V)
n –
REF
/2048. (Refer to the
V
2
REF
8
0.5
12-21
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