參數(shù)資料
型號: M34551E8FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù): 147/155頁
文件大?。?/td> 1329K
代理商: M34551E8FP
APPLICATION
2.2 Interrupts
2-13
4551 Group User’s Manual
Fig. 2.2.2 External interrupt setting example
Note: The valid waveforms causing the interrupt must be retained at their level for 4 cycles or more
of system clock.
Set Port
Port used for external interrupt is set to input port.
Set to input (SD instruction)
Clear the external interrupt activated condition
(SNZ0 instruction)
!! ! 0
b3
b0
b3
b0
! 1 !!
b0
b3
! 0 !!
Interrupt enable flag INTE
Interrupt control register V1
“0”
Disable Interrupts
External interrupt is temporarily disabled.
All interrupts disabled (DI instruction)
External interrupt occur disabled (TV1A instruction)
Port D5 output latch “1”
Set Valid Waveform
Valid waveform of INT pin is selected.
Interrupt control register I1
Rising waveform selected (TI1A instruction)
Falling waveform selected (TI1A instruction)
g Note when interrupt valid waveform is changed
When is executed, depending on the input state of INT pin, the interrupt request
flag EXF0 may be set to “1.”
Accordingly, insert the NOP instruction after the TI1A instruction.
Clear Interrupt Request
External interrupt activated condition is cleared.
External interrupt request flag EXF0 “0”
g Note when interrupt request is cleared
When is executed, considering the skip of the next instruction according to the
interrupt request flag EXF0, insert the NOP instruction after the SNZ0 instruction.
Enable Interrupts
External interrupt which is temporarily disabled is enabled.
Interrupt control register V1
Interrupt enable flag INTE
External interrupt occur enabled (TV1A instruction)
All interrupts enabled (EI instruction)
b3
b0
!!! 1
“1”
External interrupt execution started
“!” : it can be “0” or “1.”
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