EM78P258N
8-Bit Microprocessor with OTP ROM
When an interrupt is generated by the High time down counter underflow (when
enabled), the next instruction will be fetched from address 018 and 01BH (High time
and Low time respectively).
6.8.2 Function Description
The following figure shows LGP=0 and HF=1. The IROUT waveform modulates the
Fcarrier waveform at low-time segments of the pulse.
Fcarrier
HF
low time width high time width low time width
high time width
start
IRE
IROUT
Fig. 6-11a LGP=0, HF=1, IROUT Pin Output 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 the high time width and low time width instead. This mode can produce
standard PWM waveform
Fcarrier
HF
low time width high time width low time width
high time width
start
IRE
IROUT
Fig. 6-11b LGP=0, HF=0, IROUT Pin Output Waveform
50 •
Product Specification (V1.0) 06.16.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
