Universal Remote Control R7 - SPECS SHEET Manual de usuario descargar pdf (Pagina 19)

IR REMOTE CONTROLLER S3F80KB_AN_REV 0.00 (Preliminary Spec)

3.4 IR RECEPTION MODULE

3.4.1 IR reception description

• Port 3.3 is configured as Timer1 Capture mode and falling edge interrupt. Timer1 is configured fast interrupt

by setted SYM.

• When fast interrupt is generated, fast interrupt service routine increase the counter and calcurates leader

length and every bit length. It will check limit of each signal length. If the signal is wrong, it exit from this

routine.

• If all frame is normally received, it cofirmes data correction. Custom code compare each other and data code

compare with a complemented data bar.

• If this data does not have error, the data code will be stored at pressed keypad buffer and data flag will be set

to 1. (This is to transmit stored data code next time)

• Whenever Timer0 overflow interrupt is generated, it will increase a counter variable. If this counter is

exceeded a learning mode limit, It will exit from learning mode.

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Universal Remote Control R7 - SPECS SHEET Manual de usuario Pagina 19