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 untill high time interrupt occurs.

Fcarrier

 

 

 

 

low time width high time width

low time width

high time width

HF

start

 

 

 

 

IR disable

IRE

 

 

 

 

 

IROUT

 

 

Always high- level

 

 

 

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.

Fcarrier

 

 

 

 

HF

low time width

high time width

low time width

high time width

 

start

 

 

IR disable

IRE

 

 

 

 

 

 

 

IROUT

 

 

 

 

 

 

 

 

Always high-level

Fig. 6-12d LGP=0, HF=0, When IRE goes Low from High, Irout Pin Output Waveform

Product Specification (V1.2) 05.18.2007

• 53

(This specification is subject to change without further notice)

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Image 59
IBM EM78P259N/260N manual IRE Irout