PC87393F datasheet(94/148 Pages) NSC

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5.0 Game Port (GMP) (Continued)

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5.3.14

Game Port Event Polarity Register (GMPEPOL)

This register defines the polarity of button events on which the Game Port issues an interrupt request.

This register is functional only in Enhanced mode.

Location:

Offset 0Ch

Type:

R/W

Bit

76543210

Name

Device B Button 1 Event

Polarity

Device B Button 0 Event

Polarity

Device A Button 1 Event

Polarity

Device A Button 0 Event

Polarity

Reset

00000000

Bit

Description

7-6

Device B Button 1 Event Polarity. This bit deﬁnes the event polarity on which Device B Button 1 issues an

interrupt request.

Bits

7 6

Number

0 0

None (default)

0 1

Rising edge

1 0

Falling edge

1 1

Rising and falling edge

5-4

Device B Button 0 Event Polarity. Same as bits 7-6 of this register, but for Device B Button 0.

Bits

5 4

Number

0 0

None (default)

0 1

Rising edge

1 0

Falling edge

1 1

Rising and falling edge

3-2

Device A Button 1 Event Polarity. Same as bits 7-6 of this register, but for Device A Button 1.

Bits

3 2

Number

0 0

None (default)

0 1

Rising edge

1 0

Falling edge

1 1

Rising and falling edge

1-0

Device A Button 0 Event Polarity. Same as bits 7-6 of this register, but for Device A Button 0.

Bits

1 0

Number

0 0

None (default)

0 1

Rising edge

1 0

Falling edge

1 1

Rising and falling edge

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