529
Chapter 15
A/D Converter
Preliminary User’s Manual U15839EE1V0UM00
(a) Conversion time setting
In order to prevent a drastic change of A/D conversion time even when the oscillation frequency is
changed, the conversion speed of an A/D conversion can be adjusted. By the selection bits FR3 to
FR0 in the ADM register the number of the conversion clocks can be set in the range of 84 to 216.
However, the settings modifying the conversion time (T
CONV
) must keep the following relation :
Example:
Provided that
f
PCLK
= 16 MHz
A setting of bits FR3 to FR0 = 0101B will be chosen. The conversion time is
By this the conversion time results in
5
µ
s
T
CONV
12
µ
s
≤
≤
T
CONV
Conversion Clocks
FR3 to FR0
(
)
1
f
PCLK
-------------
=
84
1
16 MHz
-------------------
=
T
CONV
5.25
µ
s
=
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