m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 156

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.6.6 Connection diagram [Reception of remote-control signal]
Fig. 2.6.7 Function block diagram [Reception of remote-control signal]
142
2.6.2 Interrupt interval determination function
Reception of remote-control signal
Figure 2.6.7 shows a function block diagram, and Figure 2.6.8 shows a timing chart of data determination.
Outline : Remote-control signal is read in by both of the interrupt interval determination function using a
Specifications : • Operation at f(X
Reciever
unit
noise filter and a timer interrupt.
•
•
Eliminate noise
One-sided edge
detection
Noise filter
Microcomputer hardware
• 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 s cycle)
processing routine.
3819 group
P4
2
/INT
•
2
interval judgment
One-sided edge
Interrupt interval
determination
register
IN
) = 8 MHz in the high-speed mode.
2.6 Interrupt interval determination function
3819 Group USER’S MANUAL
Reciever
unit
•
•
Determination
of header or 0/1
Read out a register
Compare the readout
value with the reference
value
Microcomputer software
Remote-control
1-byte reception
MITSUBISHI MICROCOMPUTER
3819 Group
•
each code
Recognition of
Data check