4571 Datasheet, PDF (11/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4571 Group
(Note 1)
P20/INT0
(Note 1)
I13
I12
Falling
0
1
Rising
L10
One-sided edge
I11
detection circuit
0
1
Both edges
detection circuit
SNZI0 instruction
EXF0
External 0
interrupt
Timer 1 count start
synchronization
circuit input
Skip
(Note 2) _L11
Level detection circuit
0
Edge detection circuit
1
Key-on wakeup input
(Note 3)
(Note 1)
P21/INT1
(Note 1)
I23
I22
Falling
0
1
Rising
L12
One-sided edge
I21
detection circuit
0
1
Both edges
detection circuit
EXF1
SNZI1 instruction
Skip
(Note 2) _L13
Level detection circuit
0
Edge detection circuit
1
(Note 3)
External 1
interrupt
Key-on wakeup input
Note 1:
This symbol represents a parasitic diode on the port.
2: When IX2= 0(X=0 or 1) is 0, “L” level is detected.
When IX2 is 1, “H” level is detected.
3: When IX2 is 0, falling edge is detected.
When IX2 is 1, rising edge is detected.
Fig 6. Port block diagram (4)
Rev.1.02 May 25, 2007 Page 11 of 124
REJ03B0179-0102