參數(shù)資料
型號: S1C88816D
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, UUC164
封裝: DIE-164
文件頁數(shù): 42/173頁
文件大?。?/td> 1411K
代理商: S1C88816D
128
EPSON
S1C88816 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (A/D Converter)
5.15.7 Programming notes
(1) When the OSC3 oscillation circuit is made the
clock source, it is necessary to turn the OSC3
oscillation ON, prior to using the A/D con-
verter.
From the time the OSC3 oscillation circuit is
turning ON until oscillation stabilizes, an
interval of several msec to several 10 msec is
necessary. Consequently, you should allow an
adequate waiting time after turning the OSC3
oscillation circuit ON before starting the count
of the programmable timer. (The oscillation
start time will vary somewhat depending on the
oscillator and on external parts. Refer to the
oscillation start time example indicated in
Chapter 7, "ELECTRICAL CHARACTERIS-
TICS".)
At initial reset, OSC3 oscillation circuit is set to
OFF status.
(2) When SLEEP mode is set during A/D conver-
sion, correct A/D conversion result cannot be
obtained because the OSC3 oscillation circuit
stops. Do not set in SLEEP mode during A/D
conversion.
(3) The input clock and analog input terminals
should be set when the A/D converter stops.
Changing in the A/D converter operation may
cause a malfunction.
(4) The frequency of the input clock should be
lower than the maximum value shown in
Section 7.8, "A/D Converter Characteristics".
(5) To prevent malfunction, do not start A/D
conversion (writing to the CHS register) when
the A/D conversion clock is not being input to
the A/D converter, and do not turn the clock off
during A/D conversion.
(6) If the CHS register selects an input channel
which is not included in the analog input
terminals set by the PAD register (the PAD
register can select several terminals simulta-
neously), the A/D conversion does not result in
a correct converted value.
(7) During A/D conversion, do not operate the P1n
terminals which are not used for analog inputs
of the A/D converter (for input/output of
digital signal etc.). It affects the A/D conversion
precision.
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