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18 IR REMOTE CONTROLLER (REMC3)
Carrier signal
Data signal (Modulated data)
REMO output
REMC3CCTL.
REMC3DBCTL.
OUTINVEN bit
REMOINV bit
0
0
1
1
Carrier signal
The carrier signal is generated by comparing the values of the 8-bit counter for carrier generation that runs with
CLK_REMC3 and the setting values of the REMC3CARR.CRDTY[7:0] and REMC3CARR.CRPER[7:0] bits.
Figure 18.4.3.2 shows an example of the carrier signal generated.
Example) REMC3CARR.CRDTY[7:0] bits = 2, REMC3CARR.CRPER[7:0] bits = 8
CLK_REMC3
8-bit counter for
carrier generation
Carrier signal
The carrier signal frequency and duty ratio can be calculated by the equations shown below.
Carrier frequency = ——————
Where
f
: CLK_REMC3 frequency [Hz]
CLK_REMC3
CRPER:
REMC3CARR.CRPER[7:0] bit-setting value (1–255)
CRDTY:
REMC3CARR.CRDTY[7:0] bit-setting value (0–254)
* REMC3CARR.CRDTY[7:0] bits < REMC3CARR.CRPER[7:0] bits
The 8-bit counter for carrier generation is reset by the REMC3DBCTL.PRESET bit and is started/stopped by
the REMC3DBCTL.PRUN bit in conjunction with the 16-bit counter for data signal generation. When the
counter value is matched with the REMC3CARR.CRDTY[7:0] bits, the carrier signal waveform is inverted.
When the counter value is matched with the REMC3CARR.CRPER[7:0] bits, the carrier signal waveform is
inverted and the counter is reset to 0x00.
Data signal
The data signal is generated by comparing the values of the 16-bit counter for data signal generation
(REMC3DBCNT.DBCNT[15:0] bits) that runs with CLK_REMC3 and the setting values of the REMC3A-
PLEN.APLEN[15:0] and REMC3DBLEN.DBLEN[15:0] bits. Figure 18.4.3.3 shows an example of the data
signal generated.
18-4
0
1
0
1
Figure 18.4.3.1 REMO Output Waveform Example
0
1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 0 1 2 3 4
Figure 18.4.3.2 Example of Carrier Signal Generated
f
CLK_REMC3
Duty ratio = ——————
CRPER + 1
Seiko Epson Corporation
Data bit
A
B
A: REMC3CARR.CRDTY[7:0] bits + 1 [clock]
B: REMC3CARR.CRPER[7:0] bits + 1 [clock]
CRDTY + 1
CRPER + 1
S1C31D50/D51 TECHNICAL MANUAL
(Eq. 18.1)
(Rev. 2.00)
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