參數(shù)資料
型號(hào)： 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(yè)數(shù)： 56/108頁(yè)
文件大小： 992K
代理商： S1C621C0D
S1C621C0 TECHNICAL MANUAL
EPSON
43
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Remote Controller)
When the REMDC output is not used, control the REM circuit ON/OFF using the REMCR register only
and fix the REMDC register at "0".
The timings of the REM circuit control such as the ON/OFF timing are explained in the following section.
Note: Except when outputting the remote control waveform, both REMCR and REMDC registers should be
fixed at "0" to prevent outputting unnecessary waveforms and to reduce current consumption.
4.9.3 Carrier
The carrier is generated by the carrier generation circuit using the OSC3 clock as the source clock. The
carrier cycle and duty ratio selections and the carrier generation circuit ON/OFF control can be done by the
software.
The control for the carrier is same procedure for both the soft-timer mode and the hard-timer mode.
Perform the carrier settings before starting the transmission in each mode.
The carrier cycle (selection as the dividing ratio of the OSC3 clock) and the duty ratio can be set using the
RCDIV register (E1HD3) and RCDTY register (E1HD2) as shown in Table 4.9.3.1.
Table 4.9.3.1 Carrier dividing ratio and duty ratio
RCDIV
0
1
RCDTY
0
1
0
1
Carrier dividing ratio
fOSC3 / 8
fOSC3 / 12
fOSC3: OSC3 oscillation frequency
Carrier duty ratio
1/4
3/8
1/3
1/4
Carrier settings can be done even when the OSC3 oscillation circuit is in OFF status. Furthermore, when
these are set once, the set contents are maintained until an initial reset is performed.
Note: The setting of the RCDIV register and the RCDTY register should be done when the REM circuit is
OFF (REMCR = REMDC = "0") before starting remote transmission. If changing the contents when
the REM circuit is ON, it may cause a malfunction.
The carrier generation circuit is switched to ON /OFF by the above mentioned REMCR and REMDC
registers. By writing "1" to either one or both registers, the carrier generation circuit goes ON and generates
the carrier. When both registers are set to "0" by writing, the carrier generation circuit goes OFF and the
carrier generation stops.
The OSC3 clock is divided to generate the carrier. Therefore, the OSC3 oscillation circuit must be ON before
starting remote output. Remote output should be done when the OSC3 oscillation has stabilized.
Note: It takes at least 5 msec from the time the OSC3 oscillation circuit goes ON until the oscillation
stabilizes. Consequently, when starting a remote output, secure 5 msec or more waiting time for
oscillation stabilization after turning the OSC3 oscillation ON.
Further, the oscillation stabilization time varies depending on the external oscillator characteristics and
conditions of use, so allow ample margin when setting the waiting time.
Figure 4.9.3.1 shows the carrier waveform.
Fig. 4.9.3.1 Carrier waveform.
The carrier generation circuit starts carrier output internally in synchronization with the falling edge of the
OSC3 clock immediately after writing "1" to the REMCR register or the REMDC register.
When both REMCR and REMDC registers is set to "0", the carrier output stops without synchronization
with the OSC3 clock.
OSC3 clock
1/8 division
1/4 duty
1/8 division
3/8 duty
1/12 division
1/3 duty
1/12 division
1/4 duty
Carrier
waveform
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