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UPD17708 Datasheet(PDF) 147 Page - Renesas Technology Corp

Part # UPD17708
Description  MOS INTEGRATED CIRCUIT
PDF  358 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17708 Datasheet(HTML) 147 Page - Renesas Technology Corp

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µPD17704, 17705, 17707, 17708, 17709
12.9.2 Edge detection block
The edge detection block specifies the valid edge (rising or falling edge) of an input signal that issues the
interrupt request of INT0 to INT4 pins, by using an interrupt edge selection register.
Figure 12-21 shows the configuration and function of the interrupt edge selection register.
Figure 12-21. Configuration of Interrupt Edge Selection Register (1/2)
Caution
The external input delays about 100 ns.
Name
Flag symbol
b3
I
E
G
4
b2
I
N
T
4
S
E
L
b1
I
E
G
3
b0
I
N
T
3
S
E
L
Address
1EH
Read/Write
R/W
Interrupt edge selection 1
Power-ON reset
WDT&SP reset
CE reset
Clock stop
0
1
0
0
0
0
0
0
0
0
0
1
Interrupt pin (edge detection cricuit operates)
General-purpose port pin (edge detection cricuit stops)
Selects function of P1A2/INT3 pin
Rising edge
Falling edge
Selects input edge to issue interrupt request (INT3 pin)
Interrupt pin (edge detection cricuit operates)
General-purpose port pin (edge detection cricuit stops)
Selects function of P1A3/INT4 pin
Rising edge
Falling edge
Selects input edge to issue interrupt request (INT4 pin)
0
1
0
1
Retained
Retained



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