Cypress PSoC CY8CTMG20 Series, Technical Reference Manual

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292 PSoC CY8CTMG20x and CY8CTST200 TRM, Document No. 001-53603 Rev. *C
Glossary
firmware The software that is embedded in a hardware device and executed by the CPU. The software
may be executed by the end user but it may not be modified.
flag Any of various types of indicators used for identification of a condition or event (for example, a
character that signals the termination of a transmission).
Flash An electrically programmable and erasable, non volatile technology that provides users with the
programmability and data storage of EPROMs, plus in-system erasability. Nonvolatile means
that the data is retained when power is off.
Flash bank A group of Flash ROM blocks where Flash block numbers always begin with ‘0’ in an individual
Flash bank. A Flash bank also has its own block level protection information.
Flash block The smallest amount of Flash ROM space that may be programmed at one time and the small-
est amount of Flash space that may be protected. A Flash block holds 64 bytes.
flip-flop A device having two stable states and two input terminals (or types of input signals) each of
which corresponds with one of the two states. The circuit remains in either state until it is made
to change to the other state by application of the corresponding signal.
frequency The number of cycles or events per unit of time, for a periodic function.
G
gain The ratio of output current, voltage, or power to input current, voltage, or power, respectively.
Gain is usually expressed in dB.
ground 1. The electrical neutral line having the same potential as the surrounding earth.
2. The negative side of DC power supply.
3. The reference point for an electrical system.
4. The conducting paths between an electric circuit or equipment and the earth, or some con-
ducting body serving in place of the earth.
H
hardware A comprehensive term for all of the physical parts of a computer or embedded system, as distin-
guished from the data it contains or operates on, and the software that provides instructions for
the hardware to accomplish tasks.
hardware reset A reset that is caused by a circuit, such as a POR, watchdog reset, or external reset. A hardware
reset restores the state of the device as it was when it was first powered up. Therefore, all regis-
ters are set to the POR value as indicated in register tables throughout this manual.
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