Positive Edge

Detect Register Port

1/3

The Positive Edge Detect Register for Port 1/3 (base + 24h) is read only. If bit 4 of the Control/Status Register is low ("0"), Port 1 data is accessed. If bit 4 is high ("1"), Port 3 data will be accessed. The operation of the Positive Edge Detect Register for Port 1/3 is identical to those of Port 0/2.

Positive Edge Detect Register Port 1/3 (Channels 16-31/48-63) (base + 24h)

b + 24h

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Write

 

 

 

 

 

 

 

No Effect

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read

Ch31

Ch30

Ch29

Ch28

Ch27

Ch26

Ch25

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

Ch16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read

Ch63

Ch62

Ch61

Ch60

Ch59

Ch58

Ch57

Ch56

Ch55

Ch54

Ch53

Ch52

Ch51

Ch50

Ch49

Ch48

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Negative Edge

Detect Register Port

1/3

For Positive/Negative Edge Detect and Mask Registers, channels 16 through 31 are accessed when BS = 0 in the Status/Control Register.

For Positive/Negative Edge Detect and Mask Registers, channels 48 through 63 are accessed when BS = 1 in the Status/Control Register.

The Negative Edge Detect Register for Port 1/3 (base + 26h) is read only. If bit 4 of the Control/Status Register is low ("0"), Port 1 data is accessed. If bit 4 is high ("1"), Port 3 data will be accessed. The operation of the Negative Edge Detect Register for Port 1/3 is identical to those of Port 0/2.

Negative Edge Detect Register Port 1/3 (Channels 16-31/48-63) (base + 26h)

b + 26h

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Write

 

 

 

 

 

 

 

No Effect

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read

Ch31

Ch30

Ch29

Ch28

Ch27

Ch26

Ch25

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

Ch16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read

Ch63

Ch62

Ch61

Ch60

Ch59

Ch58

Ch57

Ch56

Ch55

Ch54

Ch53

Ch52

Ch51

Ch50

Ch49

Ch48

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Positive Mask Register Port 1/3

The Positive Mask Register for Port 1/3 (base + 28h) can be read or written. If bit 4 of the Control/Status Register is low ("0"), Port 1 data is accessed. If bit 4 is high ("1"), Port 3 data will be accessed. The operation of the Positive Mask Register for Port 1/3 is identical to those of Port 0/2.

Positive Mask Register Port 1/3 (Channels 16-31/48-63) (base + 28h)

b + 28h

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Read/Write

Ch31

Ch30

Ch29

Ch28

Ch27

Ch26

Ch25

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

Ch16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read/Write

Ch63

Ch62

Ch61

Ch60

Ch59

Ch58

Ch57

Ch56

Ch55

Ch54

Ch53

Ch52

Ch51

Ch50

Ch49

Ch48

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

88 HP E1459A Register Definitions