4518 Datasheet, PDF (15/160 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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