EM78P259N/260N
8-Bit Microprocessor with OTP ROM
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 till high-time interrupt occurs.
Fcarrier
HF
low time width high time width low time width
high time width
start
IR disable
IRE
IROUT
Always high- level
Fig. 6-11c 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.
Fcarrier
HF
low time width high time width low time width
high time width
start
IR disable
IRE
IROUT
Always high-level
Fig. 6-11d LGP=0, HF=0, When IRE goes Low from High, Irout Pin Output Waveform
54 •
Product Specification (V1.0) 06.16.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
