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88 HP E1459A Register Definitions
Positive Edge
Detect Register Port
1/3
The Positive Edge Detect Register for Port 1/3 (base + 24
h
) 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)
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.
Negative Edge
Detect Register Port
1/3
The Negative Edge Detect Register for Port 1/3 (base + 26
h
) 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)
Positive Mask
Register Port 1/3
The Positive Mask Register for Port 1/3 (base + 28
h
) 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 + 24
h
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
b + 26
h
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
b + 28
h
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