ZiLOG eZ80 User Manual

eZ80
®
CPU
User Manual
UM007714-0908 Glossary
391
register can be read from and written to using the dedicated instructions LD A,R and LD R,A,
respectively.
REQ. Request.
RES. Reset Bit; a bit manipulation instruction.
RET. Return from subroutine; a program control instruction.
RET cc. Conditional Return; a program control instruction.
RETI. Return from Interrupt; a program control instruction.
RETN. Return from nonmaskable interrupt; a program control instruction.
RL. ROMless Control. Rotate Left; a rotate instruction.
RLA. Rotate Left–Accumulator; a rotate instruction.
RLC. Rotate Left Circular; a rotate instruction.
RLCA. Rotate Left Circular–Accumulator; a rotate instruction.
RLD. Rotate Left Decimal; a rotate instruction.
ROM. See Read-Only Memory.
ROMCS. ROM Chip Select.
ROMless. No Read-Only Memory. External memory is required.
RP. Register Pointer.
RR. Read Register. Rotate Right; a rotate instruction.
RRA. Rotate Right–Accumulator; a shift instruction.
RRC. Rotate Right Circular; a shift instruction.
RRCA. Rotate Right Circular–Accumulator; a shift instruction.
RRD. Rotate Right Decimal; a shift instruction.
RSMIX. Reset MIXED MEMORY Mode Flag; a processor control instruction.
RST. Restart; a program control instruction. as opposed to RES or RESET.
S. See Sign Flag.
SBC. Subtract with Carry; an arithmetic instruction.
SCF. Set Carry Flag; a processor control instruction.
SCLK. System Clock.
SET. Set Bit; a bit manipulation instruction.
SIEF. Set IE Flag.
Sign Flag. The Sign flag stores the state of the most significant bit of the accumulator (bit 7). Single-instruc-
tion mode.
One of two types of mode changes available to the eZ80
®
. Single-instruction mode changes
allow certain instructions to operate using either ADL or Z80 addressing mode without making a persistent
change to either mode. See persistent mode.
SLA. Shift Left; a shift instruction.
SLL. Shift Left Logical.

ZiLOG eZ80 Specifications

General

Brand	ZiLOG
Model	eZ80
Category	Computer Hardware
Language	English