4559 Datasheet, PDF (17/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4559 Group
(Note 1)
D5/INT
(Note 1)
I13
I12
Falling
0
1
Rising
K20
One-sided edge
I11
detection circuit
0
or
Both edges
EXF0
External 0
1
interrupt
detection circuit
Timer 1 count start
SNZI0 instruction
synchronization
Skip decision
circuit input
(Note 2) _K21
Level detection circuit
0
Edge detection circuit
1
Key-on wakeup input
(Note 3)
Notes 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.
Fig 11. External interrupt circuit structure
Rev.1.04 Aug 23, 2007 Page 17 of 146
REJ03B0188-0104