參數(shù)資料
型號: GMS81C7208
廠商: Electronic Theatre Controls, Inc.
英文描述: NET CENTER 48" W
中文描述: 8位單晶片微控制器
文件頁數(shù): 58/93頁
文件大小: 853K
代理商: GMS81C7208
GMS81C1404/GMS81C1408
56
June. 2001 Ver 1.2
(3) Pins AN0/RB0 and AN1/RA1 to AN7/RA7
The analog input pins AN0 to AN7 also function as input/
output port (PORT RA and RB0) pins. When A/D conver-
sion is performed with any of pins AN0 to AN7 selected,
be sure not to execute a PORT input instruction while con-
version is in progress, as this may reduce the conversion
resolution.
Also, if digital pulses are applied to a pin adjacent to the
pin in the process of A/D conversion, the expected A/D
conversion value may not be obtainable due to coupling
noise. Therefore, avoid applying pulses to pins adjacent to
the pin undergoing A/D conversion.
(4) AVref
pin input impedance
A series resistor string of approximately 10K
is connected be-
tween the AVref
pin and the V
SS
pin.
Therefore, if the output impedance of the reference voltage
source is high, this will result in parallel connection
to the
series resistor string between the AVref
pin and the V
SS
pin, and
there will be a large reference voltage error.
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