NEC V850E/CA2 JUPITER Preliminary User's Manual page 529

(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
Example:
Provided that f
PCLK
A setting of bits FR3 to FR0 = 0101B will be chosen. The conversion time is
T
CONV
By this the conversion time results in
Chapter 15 A/D Converter
5 µs ≤
= 16 MHz
= Conversion Clocks FR3 to FR0
T
CONV
Preliminary User's Manual U15839EE1V0UM00
) must keep the following relation :
CONV
≤ 12 µs
T
CONV
1
( )
-------------
f
PCLK
5.25 µs
=
1
------------------ -
= 84
16 MHz
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