Table of Contents
Advertisement
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Remote Controller)
4.9 Remote Controller (REM)
4.9.1 Configuration of remote controller
The E0C6006 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.
Figure 4.9.1.2 shows the configuration of the REM circuit.
REMSO
RCDIV
f
OSC3
OSC3
oscillation
circuit
REMC
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
PPM
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 REM (R33) terminal. At initial reset and while remote output stops, the REM terminal
goes low level (V
).
SS
The carrier frequency and duty ratio can be selected by the software from among 4 types. (details are
explained later)
30
E0C6006
REM circuit
Fig. 4.9.1.1 Remote LED control circuit
RCDUTY
RT1, RT0
Carrier
τ (Reference cycle)
generation
generation circuit
Carrier
circuit
Fig. 4.9.1.2 Configuration of REM circuit
0
1
0
Fig. 4.9.1.3 Remote transmission method
V
DD
REM
(R33)
V
SS
Carrier
ROUT1, ROUT0
REMOUT
time
τ waveform
generator
RIC3–RIC0
Interrupt
counter
1
Carrier
AM
EPSON
MPX
REMOUT
Interrupt
Interrupt request
control
circuit
REM output
E0C6006 TECHNICAL MANUAL
REM
(R33)
Advertisement
Table of Contents
