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HP E1459A Register Definitions 89
Negative Mask
Register Port 1/3
The Negative Mask Register for Port 1/3 (base + 2A
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 Negative
Mask Register for Port 1/3 is identical to those of Port 0/2.
Negative Mask Register Port 1/3 (Channels 16-31/48-63) (base + 2Ah)
Debounce Clock
Register Port 0 and
Port 1/ Port 2 and
Port 3
The Debounce Clock Register (base + 2E
h
) can be read or written. This
register is a mirror image of the Debounce Clock Register at base + 1E
h
.
Refer to that register for an explanation of its operation.
Debounce Clock Register Port 0 and Port 1/Port 2 and Port 3 (base + 2Eh)
When BS = 0 in the Status/Control Register, the debounce clock for Port 0
and Port 1 are accessed. Port 0 and Port 1 use the same debounce clock. With
BS = 0 any value programmed into or read from this register will be the same
as the register at b + 2E
h
.
When BS = 1 in the Status/Status Register, the debounce clock for Port 2 and
Port 3 are accessed. Port 2 and Port 3 use the same debounce clock. With BS
= 1 any value programmed into or read from this register will be the same as
the register at b + 1E
h
.
b + 2A
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
b + 2E
h
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write No Effect DEBOUNCE TIME
Read Always Returns FFF
h
0 0 0 DEBOUNCE TIME