Cypress PSoC CY8CTMG20 Series, Technical Reference Manual

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290 PSoC CY8CTMG20x and CY8CTST200 TRM, Document No. 001-53603 Rev. *C
Glossary
chaining Connecting two or more 8-bit digital blocks to form 16-, 24-, and even 32-bit functions. Chaining
allows certain signals such as Compare, Carry, Enable, Capture, and Gate to be produced from
one block to another.
checksum The checksum of a set of data is generated by adding the value of each data word to a sum. The
actual checksum can simply be the result sum or a value that must be added to the sum to gen-
erate a pre-determined value.
chip A single monolithic Integrated Circuit (IC). See also integrated circuit (IC) .
clear To force a bit/register to a value of logic 0.
clock The device that generates a periodic signal with a fixed frequency and duty cycle. A clock is
sometimes used to synchronize different logic blocks.
clock generator A circuit that is used to generate a clock signal.
CMOS The logic gates constructed using MOS transistors connected in a complementary manner.
CMOS is an acronym for complementary metal-oxide semiconductor.
comparator An electronic circuit that produces an output voltage or current whenever two input levels simul-
taneously satisfy pre-determined amplitude requirements.
compiler A program that translates a high level language, such as C, into machine language.
configuration In a computer system, an arrangement of functional units according to their nature, number, and
chief characteristics. Configuration pertains to hardware, software, firmware, and documenta-
tion. The configuration affects system performance.
configuration space In PSoC devices, the register space accessed when the XIO bit in the CPU_F register is set to
‘1’.
crowbar A type of over-voltage protection that rapidly places a low resistance shunt (typically an SCR)
from the signal to one of the power supply rails, when the output voltage exceeds a pre-deter-
mined value.
crystal oscillator An oscillator in which the frequency is controlled by a piezoelectric crystal. Typically a piezoelec-
tric crystal is less sensitive to ambient temperature than other circuit components.
cyclic redundancy
check (CRC) A calculation used to detect errors in data communications, typically performed using a linear
feedback shift register. Similar calculations may be used for a variety of other purposes such as
data compression.
D
data bus A bidirectional set of signals used by a computer to convey information from a memory location
to the central processing unit and vice versa. More generally, a set of signals used to convey
data between digital functions.
data stream A sequence of digitally encoded signals used to represent information in transmission.
data transmission The sending of data from one place to another by means of signals over a channel.
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