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4570 Datasheet(PDF) 18 Page - Renesas Technology Corp

Part # 4570
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  69 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4570 Datasheet(HTML) 18 Page - Renesas Technology Corp

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MITSUBISHI MICROCOMPUTERS
4570 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
EXTERNAL INTERRUPTS
An external interrupt request occurs when a valid waveform (=
waveform causing the external 0 interrupt) is input to an interrupt
input pin (edge detection).
The external 0 interrupt can be controlled with the interrupt control
register I1.
Table 7 External interrupt activated condition
Name
External 0 interrupt
Input pin
P21/INT
Valid waveform
Falling waveform (“H”
→“L”)
Rising waveform (“L”
→“H”)
Valid waveform
selection bit (I12)
0
1
Fig. 17 External interrupt circuit structure
One-sided edge
detection circuit
EXF0
I12
P21/INT
0
1
Skip
SNZI0
instruction
External 0
interrupt
Falling
Rising



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