CY8C21512-24PVXAT Datasheet CY8C21512-24PVXAT, CY8C21312-24PVXA, CY8C21512-24PVXA | P31-P33

CY8C21312, CY8C21512

Document Number: 001-63745 Rev. *D Page 31 of 37

Document Conventions

Units of Measure

The following table lists the units of measure that are used in this document.

Numeric Conventions

Hexadecimal numbers are represented with all letters in uppercase with an appended lowercase ‘h’ (for example, ‘14h’ or ‘3Ah’).

Hexadecimal numbers may also be represented by a ‘0x’ prefix, the C coding convention. Binary numbers have an appended

lowercase ‘b’ (for example, ‘01010100b’ or ‘01000011b’). Numbers not indicated by an ‘h’, ‘b’, or ‘0x’ are in decimal format.

Table 26. Units of Measure

Symbol Unit of Measure Symbol Unit of Measure

C degree Celsius V microvolts

dB decibels mA milliampere

KB 1024 bytes ms millisecond

Kbit 1024 bits mV millivolts

kHz kilohertz nA nanoampere

k kilohm ns nanosecond

Mbaud megabaud  ohm

Mbps megabits per second pA picoampere

MHz megahertz pF picofarad

A microampere ps picosecond

s microsecond V volts

Glossary

active high 1. A logic signal having its asserted state as the logic 1 state.

2. A logic signal having the logic 1 state as the higher voltage of the two states.

analog blocks The basic programmable opamp circuits. These are SC (switched capacitor) and CT (continuous time) blocks.

These blocks can be interconnected to provide ADCs, DACs, multi-pole filters, gain stages, and much more.

analog-to-digital

converter (ADC)

A device that changes an analog signal to a digital signal of corresponding magnitude. Typically, an ADC converts

a voltage to a digital number. The digital-to-analog converter (DAC) performs the reverse operation.

Application

programming

interface (API)

A series of software routines that comprise an interface between a computer application and lower level services

and functions (for example, user modules and libraries). APIs serve as building blocks for programmers that create

software applications.

asynchronous A signal whose data is acknowledged or acted upon immediately, irrespective of any clock signal.

bandgap

reference

A stable voltage reference design that matches the positive temperature coefficient of VT with the negative

temperature coefficient of VBE, to produce a zero temperature coefficient (ideally) reference.

bandwidth 1. The frequency range of a message or information processing system measured in hertz.

2. The width of the spectral region over which an amplifier (or absorber) has substantial gain (or

loss); it is sometimes represented more specifically as, for example, full width at half maximum.

CY8C21312, CY8C21512

Document Number: 001-63745 Rev. *D Page 32 of 37

bias 1. A systematic deviation of a value from a reference value.

2. The amount by which the average of a set of values departs from a reference value.

3. The electrical, mechanical, magnetic, or other force (field) applied to a device to establish a reference level to

operate the device.

block 1. A functional unit that performs a single function, such as an oscillator.

2. A functional unit that may be configured to perform one of several functions, such as a digital PSoC block or

an analog PSoC block.

buffer 1. A storage area for data that is used to compensate for a speed difference, when transferring data from one

device to another. Usually refers to an area reserved for I/O operations, into which data is read, or from which

data is written.

2. A portion of memory set aside to store data, often before it is sent to an external device or as it is received

from an external device.

3. An amplifier used to lower the output impedance of a system.

bus 1. A named connection of nets. Bundling nets together in a bus makes it easier to route nets with similar routing

patterns.

2. A set of signals performing a common function and carrying similar data. Typically represented using vector

notation; for example, address[7:0].

3. One or more conductors that serve as a common connection for a group of related devices.

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.

comparator An electronic circuit that produces an output voltage or current whenever two input levels simultaneously satisfy

predetermined amplitude requirements.

compiler A program that translates a high level language, such as C, into machine language.

configuration

space

In PSoC devices, the register space accessed when the XIO bit, in the CPU_F register, is set to ‘1’.

crystal oscillator An oscillator in which the frequency is controlled by a piezoelectric crystal. Typically a piezoelectric 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

data bus A bi-directional 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.

debugger A hardware and software system that allows you to analyze the operation of the system under development. A

debugger usually allows the developer to step through the firmware one step at a time, set break points, and

analyze memory.

dead band A period of time when neither of two or more signals are in their active state or in transition.

digital blocks The 8-bit logic blocks that can act as a counter, timer, serial receiver, serial transmitter, CRC generator,

pseudo-random number generator, or SPI.

digital-to-analog

converter (DAC)

A device that changes a digital signal to an analog signal of corresponding magnitude. The analog-to-digital

converter (ADC) performs the reverse operation.

Glossary (continued)

CY8C21312, CY8C21512

Document Number: 001-63745 Rev. *D Page 33 of 37

duty cycle The relationship of a clock period high time to its low time, expressed as a percent.

emulator Duplicates (provides an emulation of) the functions of one system with a different system, so that the second

system appears to behave like the first system.

external reset

(XRES)

An active high signal that is driven into the PSoC device. It causes all operation of the CPU and blocks to stop

and return to a pre-defined state.

flash An electrically programmable and erasable, non-volatile technology that provides you the programmability and

data storage of EPROMs, plus in-system erasability. Non-volatile means that the data is retained when power is

off.

flash block The smallest amount of flash ROM space that may be programmed at one time and the smallest amount of flash

space that may be protected.

frequency The number of cycles or events per unit of time, for a periodic function.

gain The ratio of output current, voltage, or power to input current, voltage, or power, respectively. Gain is usually

expressed in dB.

C A two-wire serial computer bus by Philips Semiconductors (now NXP Semiconductors). 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 bi-directional pins, clock and data, both running at the V

suppy voltage and pulled high with resistors.

The bus operates up to100 kbits/second in standard mode and 400 kbits/second in fast mode.

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 CPU 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 V

and provides an interrupt to the system when V

falls below 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.

Glossary (continued)

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P37

CY8C21512-24PVXAT

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Description:

8-bit Microcontrollers - MCU 24 I/O 8K FLASH 512 BYTES SRAM

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