Zilog EZ80F916 - Manual (Page 393)

eZ80
®
CPU
User Manual
UM007715-0415 Glossary
384
Bit Error Ratio Tester (BERT).
A testing device that compares a received data pattern with a known
transmitted pattern to determine the level of transmission quality.
bit configuration.
The sequence of bits used to encode a character.
bit inversion.
The changing of the state of a bit to the opposite state. The changing of the state that
represents a given bit, i.e., a 0 or a 1, to the opposite state.
bit rate (BR).
In a bit stream, the number of bits occurring per unit time, usually expressed in bits per
second.
bit string.
A sequence of bits. In a bit stream, individual bit strings may be separated by data delimiters.
bps.
bits per second—the number of binary digits transmitted every second during a data-transfer
procedure.
BR.
See Bit Rate.
BRG.
Baud Rate Generator.
BUSACK.
Bus Acknowledge—a message granting permission for a device to transfer data on the bus.
BUSREQ.
Bus Request—a message from a device requesting permission to transfer data on the bus.
byte (B).
A sequence of adjacent bits (usually 8) considered as a unit. A collection of four sequential bits
of memory. Two sequential bytes (8 bits) comprise one word.
C.
Carry.
CALL.
Call Subroutine; a program control instruction.
CALL cc.
Conditional Call Subroutine; a program control instruction.
Carry Flag. The Carry Flag bit is set or reset depending on the operation performed, such as a n
ADD , which can generate a carry, or a SUBTRACT , which can generate a borrow. CCF.
Clear
Carry Flag. Complement Carry Flag; a processor control instruction.
CE.
Chip Enable.
C. See Carry Flag.
check bit.
A bit, such as a parity bit, derived from and appended to a bit string for later use in error
detection and possibly error correction.
checksum.
A field of one or more bytes appended to a block of n words that contain a truncated binary
sum formed from the contents of that block. The sum is used to verify the integrity of data in a ROM or on
a tape.
CIEF.
Clear IE Flag.
clock rate.
The rate at which a clock issues timing pulses.
CLR.
Clear.
comparator.
In analog computing, a functional unit that compares two analog variables and indicates the
result of that comparison. A device that compares two items of data and indicates the result of that
comparison. A device for determining the dissimilarity of two items such as two pulse patterns or words.
CP.
Compare with Accumulator; an arithmetic instruction.
CPD (CPDR).
Compare and Decrement (with Repeat); a compare instruction.
CPI (CPIR).
Compare and Increment (with Repeat); a compare instruction.