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EM78P259N/260N
8-Bit Microprocessor with OTP ROM
Product Specification (V1.2) 05.18.2007
• 53
(This specification is subject to change without further notice)
The following figure shows LGP=0 and HF=1. The IROUT waveform modulates the
Fcarrier waveform at low time segments of the pulse. When IRE goes low from high,
the output waveform of IROUT will keep transmitting untill high time interrupt occurs.
Fig. 6-12c LGP=0, HF=1, When IRE goes Low from High, IROUT Pin Outputs Waveform
The following figure shows LGP=0 and HF=0. The IROUT waveform cannot modulate
the Fcarrier waveform at low time segments of the pulse. So IROUT waveform is
determined by high time width and low time width. This mode can produce standard
PWM waveform when IRE goes low from high. The output waveform of IROUT will
keep on transmitting till high time interrupt occurs.
Fig. 6-12d LGP=0, HF=0, When IRE goes Low from High, Irout Pin Output Waveform
Fcarrier
IROUT
HF
IRE
IR disable
Always high-level
start
high time widthlow time width high time width low time width
Fcarrier
IROUT
HF
IRE
IR disable
Always high- level
star
t
hi
g
h time widthlow time width hi
g
h time widthlow time width