參數(shù)資料
型號： UPD17207GF
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS
中文描述： 4位單片機與LCD控制器/驅(qū)動器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì)
文件頁數(shù)： 42/120頁
文件大?。?/td> 516K
代理商： UPD17207GF
μ
PD17201A, 17207
42
Remarks 1.
The INT and RESET pins are multiplexed with test pins (refer to
3.4 NOTES ON USING RESET
AND INT PINS
).
In this figure, the RESET pin is connected to a pull-up resistor by mask option.
2.
7.3.3
Countermeasures against Noise during Transmission (Carrier Output)
When a signal is transmitted from the transmitter of a remote controller, a peak current of 0.5 to 1 A may flow through
the infrared LED. Since two batteries are usually used as the power source of the transmitter, several
of equivalent
resistance (r) exists in the power source as shown in Fig. 7-6. This resistance increases from 10 to
20
if the supply voltage drops to 2 V. While the carrier is output from the REM pin (while the infrared LED lights),
therefore, a high-frequency noise may be generated on the power lines due to the voltage fluctuation that may take
place especially during switching.
To minimize the influence on the microcontroller of this high-frequency noise, take the following measures:
1
Separate the power lines of the microcontroller from the power lines of the infrared LED with the terminals of
the batteries at the center. Use thick power lines and keep the wiring short.
Locate the oscillator as close as possible to the microcontroller and shield it with GND lines (as indicated by
the portion inside the dotted line in the figure below).
Locate the capacitor for stabilization of the power supply closely to the power lines of the microcontroller. Also,
use a capacitor to eliminate high-frequency noise.
To prevent data from changing, do not execute an interrupt that requires read/write processing and stack, such
as key scan interrupt, and the CALL/RET instruction, while the carrier is output.
To improve the reliability in case of program hang-up, use the watchdog timer (connect the WDOUT and
RESET pins).
2
3
4
5
Fig. 7-6 Example of Countermeasures against Noise
0.5 to 1 A
Infrared LED
REM
V
DD
RESET
WDOUT
Microcontroller
+
_
r
Batteries
V
SS
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