CHAPTER 10 EXTERNAL INTERRUPT CIRCUIT 1 (EDGE)

Table 10.4-1 Explanation of Functions of Each Bit in External Interrupt Control Register 1 (EIC1) (1/2)

 

Bit name

Function

 

 

 

 

 

 

 

• When a signal with an edge or edges corresponding to edge polarity selected by

 

 

EIR1:

edge polarity selection bits (SL11, SL10) is input to INT11 external interrupt

 

 

pin, this bit is set to "1".

bit7

 

External interrupt

 

• When this bit and interrupt request enable bit 1 (EIE1) are "1", the interrupt

 

 

request flag bit1

 

 

request is output.

 

 

 

 

 

 

• Writing "0" clears this bit; writing "1" does not affect this bit (no change).

 

 

 

 

 

 

 

• These bits are used to select the polarity of an edge or edges of a signal pulse that

 

 

 

triggers an interrupt when the signal is input to INT11 external interrupt pin.

 

 

 

• When these bits provide a value of "00B", edge detection is not performed and

bit6,

 

SL11, SL10:

interrupt requests are not generated.

 

Edge polarity

• These bits may specify "01B", indicating a rising edge, "10B", a falling edge, or

bit5

 

 

selection bits 1

"11B", both edges to be detected.

 

 

 

 

 

Note:

 

 

 

If an edge is selected while edge detection is OFF, edge detection may be

 

 

 

performed unconditionally. Always clear the EIR0 bit after selecting an edge.

 

 

 

 

 

 

 

This bit enables or disables interrupt request outputs to CPU. When this bit and

 

 

 

external interrupt request flag bit 1 (EIR1) are "1", the interrupt request is output.

 

 

EIE1:

Notes:

bit4

 

Interrupt request

• When using the external interrupt pin, write "0" for bit5 of the port data direction

 

 

enable bit 1

register (DDR3) so that the pin serves inputs only.

 

 

 

• Regardless of the interrupt request enable bit state, the state of the external

 

 

 

interrupt pin can be read directly from the port data register (PDR3).

 

 

 

 

 

 

 

• When a signal with an edge or edges corresponding to edge polarity selected by

 

 

EIR0:

edge polarity selection bits (SL01, SL00) is input to INT10 external interrupt

 

 

pin, this bit is set to "1".

bit3

 

External interrupt

 

• When this bit and interrupt request enable bit 0 (EIE0) are "1", the interrupt

 

 

request flag bit 0

 

 

request is output.

 

 

 

 

 

 

• Writing "0" clears this bit, and writing "1" does not affect this bit.

 

 

 

 

 

 

 

• These bits are used to select the polarity of an edge or edges of a signal pulse that

 

 

 

triggers an interrupt when the signal is input to the INT10 external interrupt pin.

 

 

 

• When these bits provide a value of "00B", edge detection is not performed and

bit2,

 

SL01, SL00:

interrupt requests are not generated.

 

Edge polarity

• These bits may specify "01B", indicating a rising edge, "10B", a falling edge, or

bit1

 

 

selection bits 0

"11B", both edges to be detected.

 

 

 

 

 

Note:

 

 

 

If edge is selected when edge detection is OFF, edge detection may be performed

 

 

 

unconditionally. Always clear the EIR0 bit after selecting an edge.

 

 

 

 

233

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Fujitsu F202RA, MB89202 manual EIR1, EIE1, EIR0, 233
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F202RA, MB89202 specifications

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