参数资料
型号: M34551E8-XXXFP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PQFP48
封装: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件页数: 142/154页
文件大小: 1778K
代理商: M34551E8-XXXFP
APPLICATION
2.2 Interrupts
2-11
4551 Group User’s Manual
(4)
Interrupt control register I1
The interrupt valid waveform for INT pin is assigned to the bit 2 of register I1.
Set the contents of this register through register A with the TI1A instruction.
In addition, the TAI1 instruction can be used to transfer the contents of register I1 to register A.
Table 2.2.2 shows the interrupt control register I1.
Table 2.2.2 Interrupt control register I1
Interrupt control register I1
at reset : 00002
at power down : state retained
R/W
This bit has no function, but read/write is enabled.
Falling waveform (“L” level of INT pin is recognized with
the SNZI0 instruction)
Rising waveform (“H” level of INT pin is recognized with
the SNZI0 instruction)
This bit has no function, but read/write is enabled.
Not used
Interrupt valid waveform for INT
pin selection bit(Note 2)
Not used
0
1
0
1
0
1
0
1
I13
I12
I11
I10
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: 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.
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