455A Datasheet, PDF (17/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

455A Group
(Note 1)
D9 /INT
(Note 1)
I1 3
I12
Falling
0
1
Rising
K20
One-sided edge _I11
detection circuit
0
Both edges
1
detection circuit
Timer 1 count start
synchronization
circuit input
EXF0
External 0
interrupt
or
SNZI0 instruction
Skip decision
(Note 2)
K21
Level detection circuit
0
Edge detection circuit
1
(Note 3)
Key-on wakeup input
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.1.01 Feb 15, 2008 Page 17 of 146
REJ03B0224-0101