3819 datasheet(156/218 Pages) RENESAS

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142

2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.6 Interrupt interval determination function

3819 Group USER’S MANUAL

2.6.2 Interrupt interval determination function

Reception of remote-control signal

Outline : Remote-control signal is read in by both of the interrupt interval determination function using a

noise filter and a timer interrupt.

Fig. 2.6.6 Connection diagram [Reception of remote-control signal]

Specifications : • Operation at f(XIN) = 8 MHz in the high-speed mode.

• The one-sided edge interval is measured.

• The noise filter is used.

• The remote control interrupt request is checked within the timer 2 interrupt (488

µs cycle)

processing routine.

Figure 2.6.7 shows a function block diagram, and Figure 2.6.8 shows a timing chart of data determination.

Fig. 2.6.7 Function block diagram [Reception of remote-control signal]

P42/INT2

Reciever

unit

3819 group

Remote-control

Reciever

unit

Noise filter

Interrupt interval

determination

Determination

of header or 0/1

1-byte reception

Data check

•

Recognition of

each code

•

Read out a register

•

Compare the readout

value with the reference

value

Microcomputer hardware

Microcomputer software

•

Eliminate noise

•

One-sided edge

detection

•

One-sided edge

interval judgment

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