DR805X Datasheet, PDF (76/79 Pages) Digital Core Design – 8-bit RISC Microcontroller Instructions set details ver 3.10

DR805x Instructions set details
3.43. XCHD
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Instruction: XCHD A, @Ri
Function: Exchange digit
Description:
XCHD exchanges the low-order nibble of the accumulator (bits 3-0,
generally representing a hexadecimal or BCD digit), with that of the
internal RAM location indirectly addressed by the specified register. The
high-order nibbles (bits 7-4) of each register are not affected. No flags
are affected.
Operation:
(PC) ← (PC) + 1
(A3-0) ↔ ((Ri)3-0)
Bytes:
1
Cycles:
3
Encoding:
1101011 i
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