PC87393F datasheet(90/148 Pages) NSC

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5.0 Game Port (GMP) (Continued)

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5.3.4

Game Port Extended Status Register (GMPXST)

This register indicates which of the corresponding game device interface events have occurred. Writing 1 to a bit clears it.

Reading a position counter clears the corresponding Counter Ready bit. Writing to a bit 0 has no effect.

This register is functional only in Enhanced mode.

Location:

Offset 02h

Type:

R/W1C

Bit

76543210

Name

Device B

Button 1

Event

Status

Device B

Button 0

Event

Status

Device A

Button 1

Event

Status

Device A

Button 0

Event

Status

Device B

Y-Position

Counter

Ready

Device B

X-Position

Counter

Ready

Device A

Y-Position

Counter

Ready

Device A

X-Position

Counter

Ready

Reset

00000000

Bit

Description

Device B Button 1 Event Status. When set to 1, it indicates that a Device B Button 1 event has occurred. The

event itself is deﬁned by the GMPEPOL register, see Section 5.3.14.

0: Event not active (default)

1: Event active

Device B Button 0 Event Status. When set to 1, it indicates that a Device B Button 0 event has occurred. The

event itself is deﬁned by the GMPEPOL register, see Section 5.3.14.

0: Event not active (default)

1: Event active

Device A Button 1 Event Status. When set to 1, it indicates that a Device A Button 1 event has occurred. The

event itself is deﬁned by the GMPEPOL register, see Section 5.3.14.

0: Event not active (default)

1: Event active

Device A Button 0 Event Status. When set to 1, it indicates that a Device A Button 0 event has occurred. The

event itself is deﬁned by the GMPEPOL register, see Section 5.3.14.

0: Event not active (default)

1: Event active

Device B Y-Position Counter Ready. When set to 1, it indicates that the value of the Y-position counter of

Device B can now be read.

0: Event not active (default)

1: Event active

Device B X-Position Counter Ready. When set to 1, it indicates that value of the X-position counter of Device

B can now be read.

0: Event not active (default)

1: Event active

Device A X-Position Counter Ready. When set to 1, it indicates that the value of the Y-position counter of

Device A can now be read.

0: Event not active (default)

1: Event active

Device A X-Position Counter Ready. When set to 1, it indicates that the value of the X-position counter of

Device A can now be read.

0: Event not active (default)

1: Event active

PC87393F Datasheet(PDF) 90 Page - National Semiconductor (TI)

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