E0C6006 TECHNICAL MANUAL
EPSON
33
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Remote Controller)
4.9.3 Soft-timer mode
In the soft-timer mode, software controls the ON/OFF time and timing of the carrier output. This mode
does not use the
τ
(reference cycle) generation circuit, REMOUT time generator and interrupt control
circuit that are used in the hard-timer mode, and operates with the configuration as shown in Figure
4.9.3.1.
OSC3
oscillation
circuit
f
OSC3
RCDIV
REMC
REMSO
REM
(R33)
Carrier
Carrier
generation
circuit
RCDUTY
Fig. 4.9.3.1 REM circuit configuration in soft-timer mode
The ON/OFF control of the carrier output is done using the REMSO register (F0H•D3). By writing "1" to
the REMSO register, the carrier is output to the REM terminal and when "0" is written, the REM terminal
goes low level (V
SS
). However, the carrier must be generated by writing "1" to the REMC register before
writing "1" to the REMSO register.
Figure 4.9.3.2 shows the timing chart in the soft-timer mode.
REMC register
Carrier
REMSO register
REM (R33) output
Fig. 4.9.3.2 Timing chart (soft-timer mode)
Note: • Writing to the REMSO register without synchronization with the carrier generation circuit, there-
fore when turning the carrier output ON/OFF using the REMSO register, the duty ratio of the
carrier will not be the value set by the software. (Figure 4.9.3.3)
REMSO register
REM (R33) output
Carrier duty ratio will be different from the value set by the software
at the time the signal turns ON/OFF using the REMSO register.
Fig. 4.9.3.3 Carrier ON/OFF by REMSO register
• Be sure to control the carrier output using the REMSO register. Do not control the carrier output
using the REMC register by setting the REMSO register to "1".