Cypress PSoC CY8CTMG20 Series, Technical Reference Manual

Page: 293 / 308

PSoC CY8CTMG20x and CY8CTST200 TRM, Document No. 001-53603 Rev. *C 293
Glossary
hexadecimal A base 16 numeral system (often abbreviated and called hex), usually written using the symbols
0-9 and A-F. It is a useful system in computers because there is an easy mapping from four bits
to a single hex digit. Thus, one can represent every byte as two consecutive hexadecimal digits.
Compare the binary, hex, and decimal representations:
bin = hex = dec
0000b = 0x0 = 0
0001b = 0x1 = 1
0010b = 0x2 = 2
...
1001b = 0x9 = 9
1010b = 0xA
= 10
1011b = 0xB = 11
...
1111b = 0xF
= 15
So the decimal numeral 79 whose binary representation is 0100 1111b can be written as 4Fh in
hexadecimal (0x4F).
high time The amount of time the signal has a value of ‘1’ in one period, for a periodic digital signal.
I
I2C
A two-wire serial computer bus by Philips Semiconductors (now NXP Semiconductors). I2C is an
inter-integrated circuit. It is used to connect low-speed peripherals in an embedded system. The
original system was created in the early 1980s as a battery control interface, but it was later used
as a simple internal bus system for building control electronics. I2C uses only two bidirectional
pins, clock and data, both running at +5V and pulled high with resistors. The bus operates at 100
kbits/second in standard mode and 400 kbits/second in fast mode.
ICE
The in-circuit emulator that allows users to test the project in a hardware environment, while
viewing the debugging device activity in a software environment (PSoC Designer™).
idle state A condition that exists whenever user messages are not being transmitted, but the service is
immediately available for use.
impedance
1. The resistance to the flow of current caused by resistive, capacitive, or inductive devices in a
circuit.
2. The total passive opposition offered to the flow of electric current. Note the impedance is
determined by the particular combination of resistance, inductive reactance, and capacitive
reactance in a given circuit.
input A point that accepts data in a device, process, or channel.
input/output (I/O)
A device that introduces data into or extracts data from a system.
instruction An expression that specifies one operation and identifies its operands, if any, in a programming
language such as C or assembly.
integrated circuit (IC) A device in which components such as resistors, capacitors, diodes, and transistors are formed
on the surface of a single piece of semiconductor.
interface The means by which two systems or devices are connected and interact with each other.
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