參數(shù)資料
型號: 4571
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機(jī)的CMOS
文件頁數(shù): 41/126頁
文件大?。?/td> 1627K
代理商: 4571
Rev.1.02
May 25, 2007
Page 21 of 124
REJ03B0179-0102
4571 Group
EXTERNAL INTERRUPTS
The 4571 Group has the external 0 interrupt and external 1
interrupt. An external interrupt request occurs when a valid
waveform is input to an interrupt input pin (edge detection).
The external interrupt can be controlled with the interrupt control
registers I1 and I2.
Fig 23. External interrupt circuit structure
Table 14 External interrupt activated conditions
Name
Input pin
Activated condition
Valid waveform
selection bit
External 0 interrupt
P20/INT0
When the next waveform is input to P20/INT0 pin
Falling waveform (
H
L)
Rising waveform (
L
H)
Both rising and falling waveforms
I11
I12
External 1 interrupt
P21/INT1
When the next waveform is input to P21/INT1 pin
Falling waveform (
H
L)
Rising waveform (
L
H)
Both rising and falling waveforms
I21
I22
Key-on wakeup input
SNZI0 instruction
(Note 1)
L11
0
1
Edge detection circuit
Level detection circuit
P20/INT0
I13
I12
Falling
0
1
Rising
L10
I11
0
1
One-sided edge
detection circuit
Both edges
detection circuit
Skip
EXF0
External 0
interrupt
Timer 1 count start
synchronization
circuit input
(Note 2)
(Note 3)
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.
(Note 1)
Key-on wakeup input
SNZI1 instruction
(Note 1)
L13
0
1
Edge detection circuit
Level detection circuit
P21/INT1
I23
I22
Falling
0
1
Rising
L12
I21
0
1
One-sided edge
detection circuit
Both edges
detection circuit
Skip
EXF1
External 1
interrupt
(Note 2)
(Note 3)
(Note 1)
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