4509 Datasheet, PDF (13/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
(Note 1)
P13/INT
I13
I12
Falling
0
1
Rising
L10
One-sided edge
detection circuit
I11
0
1
Both edges
detection circuit
SNZI0 instruction
Skip
(Note 2)
Level detection circuit
Edge detection circuit
(Note 3)
EXF0
External 0
interrupt
Timer 1 count start
synchronization
circuit input
L11
0
Key-on wakeup input
1
Note 1: ^•
This symbol represents a parasitic diode on the port.
2: When I12 is 0, “L” level is detected.
When I12 is 1, “H” level is detected.
3: When I12 is 0, falling edge is detected.
When I12 is 1, rising edge is detected.
External interrupt circuit structure
Rev.1.02 2006.12.22 page 13 of 140
REJ03B0147-0102