M38B53M4-059FP datasheet(228/355 Pages) MITSUBISHI

228 / 355 page

38B5 Group User’s Manual

APPLICATION

2-140

2.7 Interrupt interval determination function

2.7.3 Interrupt interval determination function application examples

(1)

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. 2.7.7 Connection diagram

Specifications: • Measurement of one-sided edge interval

• Use of noise filter

• Check of remote control interrupt request within the timer 2 interrupt (488

µs

period) processing routine

• Operation at f(XIN) = 4 MHz in high-speed mode

Figure 2.7.8 shows the function block diagram, and Figure 2.7.9 shows a timing chart of data

determination.

Fig. 2.7.8 Function block diagram

Fig. 2.7.9 Timing chart of data determination

P47/INT2

Receiver

unit

38B5 Group

Remote controller

Noise filter

Interrupt interval

determination

Determination

of header or

0/1

1-byte

reception

Data

check

• Recognition bit

number of each

code

• Read out register

• Comparison of

read out value with

reference value

Microcomputer hardware

Microcomputer software

• Noise elimination

• One-sided edge

detection

• One-sided edge

interval

judgment

Receiver

unit

Input (INT2)

Interrupt request

Timer 2 interrupt

(488

µs)

Interrupt interval

determination

Data determinationIgnoreHeader0

Check of excess bit

(Overflow)

1-byte reception

• • •IgnoreIgnore

M38B53M4-059FP Datasheet(PDF) 228 Page - Mitsubishi Electric Semiconductor

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