參數(shù)資料
型號(hào)： S1C88848D0A0100
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, UUC192
封裝： DIE-192
文件頁數(shù)： 25/174頁
文件大?。?/td> 1304K
代理商： S1C88848D0A0100
112
EPSON
S1C88848 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Remote Controller)
5.13 Remote Controller (REM)
5.13.1 Configuration of remote controller
The S1C88848 has a remote controller (REM circuit)
built-in. It can easily adapt to various remote
controllers by connecting an infrared remote LED
and a transistor as shown in Figure 5.13.1.1.
REM
(R26)
S1C88848
REM circuit
VSS
VDD
Fig. 5.13.1.1 Remote LED control circuit
Figure 5.13.1.2 shows the configuration of the REM
circuit.
The generally used infrared remote controllers
employ a method that generates transmission
waveforms in pulse modulation as shown in Figure
5.13.1.3 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.
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 (R26)
terminal. At initial reset and while remote output
stops, the REM (R26) terminal goes low level (VSS).
The carrier frequency and duty ratio can be selected
by the software from among 4 types. (details are
explained later) This remote controller supports the
following two modes for controlling the
modulation signal (carrier ON/OFF).
Soft-timer mode (Software timer control mode)
Hard-timer mode (Hardware timer control mode)
In the soft-timer mode, the carrier ON/OFF timing
and the time are controlled by the software. The
optional ON/OFF time can be set within the range
that is controlled by the software. In the hard-timer
mode, the carrier ON/OFF timing and the output
time are controlled by the REMOUT time generator
based on the reference cycle (
τ) that is generated by
the
τ (reference cycle) generation circuit dividing
the carrier. For the reference cycle (
τ), the carrier
dividing ratio can be selected by the software from
4 types. The REMOUT (REM output) time can be
selected by the software from 4 types, 0 to 3 times
as long as the reference cycle (
τ). The ON/OFF time
is limited to some extent in comparison with the
soft-timer mode, but the software's share is
decreased because the interrupt can be used.
Features of the soft-timer mode and hard-timer
mode are shown in Table 5.13.1.1.
OSC3
oscillation
circuit
fOSC3
RCDIV
REMC
RCDUTY3–RCDUTY0
τ (Reference cycle)
generation circuit
RT1, RT0
ROUT1, ROUT0
RIC3–RIC0
Interrupt
counter
MPX
Interrupt request
REMSO
REM
(R26)
Carrier
generation
circuit
REMOUT
time
generator
REMOUT
τ waveform
Interrupt
control
circuit
Fig. 5.13.1.2 Configuration of REM circuit
Transmission code
0101
01
0
1
PPM
AM
Carrier
REM output
Fig. 5.13.1.3 Remote transmission method
Table 5.13.1.1 Features of soft-timer mode and hard-timer mode
Item
Processing of other routines during REM output
Reference cycle (
τ) sway
during REM transmission
Setting of REM output width
Relation between REM reference cycle
and modulation frequency cycle
Carrier waveform
Possible
Source oscillation sway only
Fixed to several widths
Fixed to several cycles
Stabilized at setting
Hard-timer mode
Difficult
Source oscillation sway and errors
caused by instruction cycles
Variable to any width
Variable
Duty slightly disturbed before and after ON time
Soft-timer mode
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