Universal Remote Control R7 - SPECS SHEET Manual de usuario descargar pdf (Pagina 10)

S3F80KB_AN_REV 0.00 (Preliminary Spec) IR REMOTE CONTROLLER

Bit 1 Bit 0

0.56ms

1.69ms

0.56ms 0.56ms

REM

OFF

REM

OFF

REM

Figure 4. Timer1 IR Transmission

2.5.3 Port

Port 0 and Port 1 is used to implement Key matrix. Port 0.0 ~ 0.3 is configured as Input mode with external

interrupt. Pull up resistor is enabled to generate interrupt at falling edge. Port 1.0 ~ 1.3 is configured as open drain

mode. When the key is pressed, port 0.0 ~ 0.3 will be low by port 1.0~1.3, then external interrupt will be

generated.

Port 3.1 is dedicated for IR drive pin. P3.7 is not configured for I/O pin and it only used to control carrier signal

on/off.

2.6 RECEPTION MODE

2.6.1 Timer 1

When the remote controller mode is IR reception mode, Timer1 interrupt is configured as capture mode and fast

inerrupt. Timer1 is used to generate a capture interrupt when falling edge is detected from IR signal which is

received by IR sensor. Timer1 fast interrupt service routine stores up time when fast interrupt is generated. It is to

count between falling edge and next falling edge of the IR signal. At the same time fast interrupt service routine

countes the number of times of the fast interrupt. It is to counte a distance of the high and low signal.

2.6.2 Timer 0

Timer0 countes learning mode operation time. Timer 0 is configured as pwm mode and it generates overflow

interrupt to compute a duration from start time to end time of the learning mode.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 30 31

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Universal Remote Control R7 - SPECS SHEET Manual de usuario Pagina 10