Technical data

9050 Peripherals 7-3
General Purpose Interface (GPIO) - HP 27112A
Features
• Choice of programmable operating modes (clocked or transparent) for ease of use with instru-
mentation.
• 5upports + 5 V level on all input and output signals, plus an optional + 12 V level on output
signals.
• Programmed data detection for either positive true or ground true levels.
• Independent 16 bit input and output buses and storage registers.
• Two control and two status lines.
Configuration
Normal switch settings depend on which peripheral device is connected to the GPIO. The 97060A
Graphics Processor requires the following GPIO switch settings. When the switch is up, it is in the
open position.
The switches correspond to:
5W1 51:
DIN;
52: CT5 and 5T5;
53:
P5ET;
54: PDIR;
55: DOUT;
56: PEND
57: PFLAG
58: PCNTL;
Up
- Positive True.
Down - Negative True.
Up - Positive True.
Down - Negative True.
Up - Positive True.
Down - Negative True.
Up - Positive True.
Down - Negative True.
Up - Positive True.
Down - Negative True.
Up - Positive True.
Down - Negative True.
Up - Positive True.
Busy - High.
Ready - Low.
Down - Negative True
(HP 97060A).
Busy - Low.
Ready - High.
Up - Positive True.
Active - High.
Idle - Low.
Down - Negative True.
Active - Low.
Idle - High.