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4518 Datasheet(PDF) 15 Page - Renesas Technology Corp

Part # 4518
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  160 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4518 Datasheet(HTML) 15 Page - Renesas Technology Corp

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Rev.3.01
2005.06.15
page 15 of 157
REJ03B0008-0301
4518 Group
Port block diagram (7)
Rising
Falling
One-sided edge
detection circuit
Key-on wakeup
External 1
interrupt
Timer 3 count start
synchronous circuit
Level detection circuit
Edge detection circuit
Skip decision
(SNZI1 instruction)
Both edges
detection circuit
0
1
I22
0
1
EXF1
I21
P31/INT1
K22
I23
0
1
K23
Rising
0
1
Falling
I12
One-sided edge
detection circuit
Key-on wakeup
0
1
EXF0
External 0
interrupt
I11
P30/INT0
K20
Timer 1 count start
synchronous circuit
I13
(Note 1)
Level detection circuit
Edge detection circuit
0
1
K21
Skip decision
(SNZI0 instruction)
Both edges
detection circuit
This symbol represents a parasitic diode on the port.
Notes 1:
(Note 2)
(Note 3)
(Note 1)
(Note 2)
(Note 3)
2: I12 (I22) = 0: “L” level detected
I12 (I22) = 1: “H” level detected
3: I12 (I22) = 0: Falling edge detected
I12 (I22) = 1: Rising edge detected
Period measurement
circuit input



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