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): 150/155頁
文件大?。?/td> 1329K
代理商: M34551E8FP
APPLICATION
2.2 Interrupts
2-16
4551 Group User’s Manual
2.2.4 Notes on use
(1)
Setting of external interrupt valid waveform
Depending on the input state of D5/INT pin, the external interrupt request flag (EXF0) may be set to
“1” when the interrupt valid waveform is changed. Accordingly, set a value to the bit 2 of register I1,
and execute the SNZ0 instruction to clear the EXF0 flag to “0” after executing at least one instruction.
(2)
Multiple interrupts
Multiple interrupts cannot be used in the 4551 Group.
(3)
Notes on interrupt processing
When the interrupt occurs, at the same time, the interrupt enable flag INTE is cleared to “0” (interrupt
disable state). In order to enable the interrupt at the same time when system returns from the
interrupt, write EI and RTI instructions continuously.
(4)
D5/INT pin
The D5/INT pin need not be selected the external interrupt input INT function or the normal output
port D5 function. However, the EXF0 flag is set to “1” when a valid waveform output from port D5
is input to INT pin even if it is used as an output port D5.
(5)
Power down instruction
Be sure to disable interrupts by executing the DI instruction before executing the EPOF instruction.
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