DMC73C168 Просмотр технического описания (PDF) - Daewoo Semiconductor

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DMC73C168

8Bit Single Chip Microcontroller

Daewoo Semiconductor 

8Bit Single Chip Microcontroller

40

DMC73C168

1) The port (A7/INT3, A6/INT4) used as the interrupt input should be input mode. The output

mode may cause to damage the device. If the content of the corresponding output port is

changed '1' to'0', the interrupt flag will also set to '1'.

2) If not used as the interrupt input, the corresponding Interrupt enable should be disabled,

but even if this interrupt Enable being disabled, the Interrupt Flag will be changed.

The External interrupt timing is shown in Figure 5-4B. And it needs an biditional circuitry when INT1,

INT3, INT4-0 are used as zero cross detector as shown in Figure 5-4C and the following conditions are

to be satisfied.

1) The External interrupt level should be range from VDD+0.3V to VSS, and it is necessary

for input current not to exceed the specification.

2) The noise on interrupt signal should be minimized because the noise debounce logic is not

implemented on chip. So the function may be failed due to the continuous interrupt.

VDD

External

VT+

Input Signal

VT-

VSS

Interrupt

Execution

1

Last

Happen

0

Falling Edge

Interrupt happen

Figure 5-4B External Interrupt Timing

Input

VDD

Resistor

DMC73C168

INT1

INT3

INT4-0

VSS

Figure 5-4C Additional Circuitry for External Input

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