4513_03 Datasheet, PDF (39/210 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCOMPUTER

HARDWARE
FUNCTION BLOCK OPERATIONS
EXTERNAL INTERRUPTS
The 4513/4514 Group has two external interrupts (external 0 and
external 1). An external interrupt request occurs when a valid
waveform is input to an interrupt input pin (edge detection).
The external interrupts can be controlled with the interrupt control
registers I1 and I2.
Table 7 External interrupt activated conditions
Name
Input pin
Activated condition
External 0 interrupt P30/INT0
External 1 interrupt P31/INT1
When the next waveform is input to P30/INT0 pin
• Falling waveform (“H”→“L”)
• Rising waveform (“L”→“H”)
• Both rising and falling waveforms
When the next waveform is input to P31/INT1 pin
• Falling waveform (“H”→“L”)
• Rising waveform (“L”→“H”)
• Both rising and falling waveforms
Valid waveform
selection bit
I11
I12
I21
I22
P30/INT0
I12
Falling
0
1
Rising
One-sided edge
detection circuit
I11
0
1
Both edges
detection circuit
Wakeup
Skip
SNZI0
EXF0
External 0
interrupt
P31/INT1
I22
Falling
0
1
Rising
One-sided edge
detection circuit
Both edges
detection circuit
Wakeup
Skip
SNZI1
I21
0
1
EXF1
External 1
interrupt
This symbol represents a parasitic diode on the port.
Fig. 17 External interrupt circuit structure
1-26
4513/4514 Group User’s Manual