參數(shù)資料
型號(hào)： M34501M4
廠商： Mitsubishi Electric Corporation
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(yè)數(shù)： 21/113頁(yè)
文件大?。?/td> 1252K
代理商： M34501M4
21
4501 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Table 7 External interrupt activated conditions
Name
External 0 interrupt
Input pin
INT
Activated condition
When the next waveform is input to INT pin
Falling waveform (“H”
→
“L”)
Rising waveform (“L”
→
“H”)
Both rising and falling waveforms
Valid waveform
selection bit
I1
1
I1
2
Fig. 17 External interrupt circuit structure
EXTERNAL INTERRUPTS
The 4501 Group has the external 0 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
register I1.
(1) External 0 interrupt request flag (EXF0)
External 0 interrupt request flag (EXF0) is set to “1” when a valid
waveform is input to INT pin.
The valid waveforms causing the interrupt must be retained at their
level for 4 clock cycles or more of the system clock (Refer to Figure
16).
The state of EXF0 flag can be examined with the skip instruction
(SNZ0). Use the interrupt control register V1 to select the interrupt
or the skip instruction. The EXF0 flag is cleared to “0” when an in-
terrupt occurs or when the next instruction is skipped with the skip
instruction.
External 0 interrupt activated condition
External 0 interrupt activated condition is satisfied when a valid
waveform is input to INT pin.
The valid waveform can be selected from rising waveform, falling
waveform or both rising and falling waveforms. An example of
how to use the external 0 interrupt is as follows.
Set the bit 3 of register I1 to “1” for the INT pin to be in the input
enabled state.
Select the valid waveform with the bits 1 and 2 of register I1.
Clear the EXF0 flag to “0” with the SNZ0 instruction.
Set the NOP instruction for the case when a skip is performed
with the SNZ0 instruction.
Set both the external 0 interrupt enable bit (V1
0
) and the INTE
flag to “1.”
The external 0 interrupt is now enabled. Now when a valid wave-
form is input to the INT pin, the EXF0 flag is set to “1” and the
external 0 interrupt occurs.
0
1
I1
2
l
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0
1
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Wakeup
Skip
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This symbol represents a parasitic diode on the port.
Timer 1 count start
synchronization
circuit input
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