HP E1459A - Manual (Page 84)

HP E1459A Register Definitions 83
Channel Data
Register Port 0/2
The Channel Data Register for Port 0/2 (base + 12
h
) is read only. This
register returns the current (last) data that has been clocked into the edge
detection circuitry based on either the internal or external trigger source. If
bit 4 of the Control/Status Register is low ("0"), Port 0 is accessed. If bit 4
is high ("1"), Port 2 data will be accessed.
Channel Data Register Port 0/2 (Channels 0-15/32-47) (base + 12h)
Channels 0 through 15 are accessed when BS = 0 in the Status/Control
Register.
Channels 32 through 47 are accessed when BS = 1 in the Status/Control
Register.
Positive Edge
Detect Register Port
0/2
The Positive Edge Detect Register for Port 0/2 (base + 14
h
) is read only.
This register captures any low to high transitions with a "1" in this register
for any channel that has been enabled. A channel is enabled by setting a
corresponding bit in the Positive Mask Register. Once the register is read,
the data is automatically cleared. A transition is only seen if it is held long
enough to pass through the debouncers. If bit 4 of the Control/Status
Register is low ("0"), Port 0 data is accessed. If bit 4 is high ("1"), Port 2
data will be accessed.
Positive Edge Detect Register Port 0/2 (Channels 0-15/32-47) (base + 14h)
For Positive/Negative Edge Detect and Mask Registers, channels 0 through
15 are accessed when BS = 0 in the Status/Control Register.
For Positive/Negative Edge Detect and Mask Registers, channels 32 through
47 are accessed when BS = 1 in the Status/Control Register.
b + 12 h 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write No Effect
Read Ch15 Ch14 Ch13 Ch12 Ch11 Ch10 Ch9 Ch8 Ch7 Ch6 Ch5 Ch4 Ch3 Ch2 Ch1 Ch0
Read Ch47 Ch46 Ch45 Ch44 Ch43 Ch42 Ch41 Ch40 Ch39 Ch38 Ch37 Ch36 Ch35 Ch34 Ch33 Ch32
b + 14
h
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write No Effect
Read Ch15 Ch14 Ch13 Ch12 Ch11 Ch10 Ch9 Ch8 Ch7 Ch6 Ch5 Ch4 Ch3 Ch2 Ch1 Ch0
Read Ch47 Ch46 Ch45 Ch44 Ch43 Ch42 Ch41 Ch40 Ch39 Ch38 Ch37 Ch36 Ch35 Ch34 Ch33 Ch32
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