CY8C20121 datasheet(39/43 Pages) CYPRESS

39 / 43 page

CY8C20111, CY8C20121

Document Number: 001-53516 Rev. *G

Page 39 of 43

ICE

The in-circuit emulator that allows you to test the project in a hardware environment, while

viewing the debugging device activity in a software environment (PSoC Designer).

input/output (I/O) A device that introduces data into or extracts data from a system.

interrupt

A suspension of a process, such as the execution of a computer program, caused by an event

external to that process, and performed in such a way that the process can be resumed.

interrupt service

routine (ISR)

A block of code that normal code execution is diverted to when the M8C receives a hardware

interrupt. Many interrupt sources may each exist with its own priority and individual ISR code

block. Each ISR code block ends with the RETI instruction, returning the device to the point in

the program where it left normal program execution.

jitter

1. A misplacement of the timing of a transition from its ideal position. A typical form of corruption that occurs on

serial data streams.

2. The abrupt and unwanted variations of one or more signal characteristics, such as the interval between

successive pulses, the amplitude of successive cycles, or the frequency or phase of successive cycles.

low-voltage detect

(LVD)

A circuit that senses VDD and provides an interrupt to the system when VDD falls lower than a selected threshold.

M8C

An 8-bit Harvard-architecture microprocessor. The microprocessor coordinates all activity inside

a PSoC by interfacing to the Flash, SRAM, and register space.

master device

A device that controls the timing for data exchanges between two devices. Or when devices are

cascaded in width, the master device is the one that controls the timing for data exchanges

between the cascaded devices and an external interface. The controlled device is called the

slave device.

microcontroller

An integrated circuit chip that is designed primarily for control systems and products. In addition

to a CPU, a microcontroller typically includes memory, timing circuits, and I/O circuitry. The reason

for this is to permit the realization of a controller with a minimal quantity of chips, thus

achieving maximal possible miniaturization. This in turn, reduces the volume and the cost of

the controller. The microcontroller is normally not used for general-purpose computation as is a

microprocessor.

mixed-signal

The reference to a circuit containing both analog and digital techniques and components.

modulator

A device that imposes a signal on a carrier.

noise

1. A disturbance that affects a signal and that may distort the information carried by the signal.

2. The random variations of one or more characteristics of any entity such as voltage, current, or data.

oscillator

A circuit that may be crystal controlled and is used to generate a clock frequency.

parity

A technique for testing transmitting data. Typically, a binary digit is added to the data to make the

sum of all the digits of the binary data either always even (even parity) or always odd (odd parity).

Phase-locked

loop (PLL)

An electronic circuit that controls an oscillator so that it maintains a constant phase angle relative

to a reference signal.

pinouts

The pin number assignment: the relation between the logical inputs and outputs of the PSoC

device and their physical counterparts in the printed circuit board (PCB) package. Pinouts

involve pin numbers as a link between schematic and PCB design (both being computer generated

files) and may also involve pin names.

20. Glossary (continued)

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