eZ80 CPU - writeframeofmind.biz

eZ80 CPU
User Manual
126
RRD
Rotate Right Digit
Operation
A
7 4 3 0 7 4 3 0 (HL)
Description
The contents of the low-order four bits of the memory location (HL) are copied
into the low-order four bits of the Accumulator. The previous contents of the loworder
four bits of the Accumulator are copied into high-order four bits of the
same memory location. The previous contents of the high-order four bits of the
memory location are copied into the low-order four bits of the memory location.
Condition Bits Affected
S
Z
H
P/V
N
C
Set if the Accumulator is negative; reset otherwise.
Set if the Accumulator is zero; reset otherwise.
Reset.
Set if parity of the Accumulator is even; reset otherwise.
Reset.
Not affected.
Mnemonic Operands ADL Mode Cycles Op Codes
RRD — X 5 ED, 67
UM007701-1100