Zilog Z80380 - Manual (Page 108)

Glossary
Glossary-6 UM004001-COR1103
OPC Operation Code.
Op Code Operation Code.
OTP One-Time Programmable.
PCON Port configuration register.
PER Peripheral. A device which supports the import or
output of information.
POP Retrieve a Value from the Stack.
POR Power-On Reset.
Port The point at which a communications circuit termi-
nates at a Network, Serial, or Parallel Interface card.
PRE Prescaler.
PROM Programmable Read-Only Memory.
Protocol Formal set of communications procedures governing
the format and control between two communications
devices. A protocol determines the type of error
checking to be used, the data compression method, if
any, how the sending device indicates that it has
finished sending a message, and how the receiving
device indicates that it has received a message.
PRT Programmable Reload Timer or Print.
PTR Pointer.
PTT Post, Telephone, and Telegraph. Agency in many
countries that is responsible for providing telecommu-
nication approvals.