ZiLOG eZ80 User Manual page 400

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