EM78P341 datasheet(68/102 Pages) EMC

68 / 102 page

EM78P341N/342N/343N

8-Bit Microprocessor with OTP ROM

•

Product Specification (V1.0) 12.01.2006

(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 until high-time interrupt occurs.

low time width

high time width

low time width

high time width

Fcarrier

IROUT

IRE

IR disable

Start

Always high-level

Fig. 6-13c 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 until high-time interrupt occurs.

low time width

high time width

low time width

high time width

Fcarrier

IROUT

IRE

IR disable

Start

Always high-level

Fig. 6-13d LGP=0, HF=0, When IRE goes Low from High, Irout Pin Output Waveform

EM78P341 Datasheet(PDF) 68 Page - ELAN Microelectronics Corp