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參數資料
| 型號： | S1C621C0D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 1.3 MHz, MICROCONTROLLER, UUC74 |
| 封裝： | DIE-74 |
| 文件頁數： | 53/108頁 |
| 文件大?。?/td> | 992K |
| 代理商： | S1C621C0D |
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S1C621C0 TECHNICAL MANUAL
EPSON
41
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Remote Controller)
4.9 Remote Controller (REM)
4.9.1 Configuration of remote controller
The S1C621C0 has a remote controller (REM circuit) built-in. It can easily adapt to various remote control-
lers by connecting an infrared remote LED and a transistor as shown in Figure 4.9.1.1.
REMCR
(R00)
S1C621C0
REM circuit
VSS
VDD
Fig. 4.9.1.1 Remote LED control circuit
Figure 4.9.1.2 shows the configuration of the REM circuit.
OSC3
oscillation
circuit
fOSC3
RCDIV RCDTY
τ (Reference cycle)
generation circuit
RT1
RT0
ROUT0–ROUT3
τ waveform
REMSO
RIC0–RIC3
Interrupt
counter
Interrupt
control
circuit
Interrupt request
REMCR REMDC
REMCR
(R00)
REMDC
(R01)
Carrier
generation
circuit
Pulse
modulation
circuit
ON/OFF or reset signal
Fig. 4.9.1.2 Configuration of REM circuit
The generally used infrared remote controllers employ a method that generates transmission waveforms in
pulse modulation as shown in Figure 4.9.1.3 and transmits the signal.
First the transmission code is modulated in a pulse phase modulation (PPM) method to generate the
modulation signal, and the carrier that has constant frequency is amplitude-modulated (AM) using the
modulation signal. As a result, transmission waveforms are generated. Transmission is done by driving the
infrared LED using the transmission waveform.
Transmission code
0101
01
0
1
PPM
AM
Carrier
REMCR output
Fig. 4.9.1.3 Remote transmission method
In this remote controller, the carrier generated from the carrier generation circuit is controlled to turn the
output ON and OFF and the transmission waveform is generated. This transmission waveform can be
output from the REMCR (R00) terminal. Furthermore, the DC signal (above mentioned PPM modulation
signal) that decides the ON/OFF timing for the carrier can be output from the REMDC (R01) terminal.
The carrier frequency and duty ratio can be selected by the software from among 4 types. (details are
explained later)
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