A-131
INSTRUCTION SET REFERENCE
XCH A,@Ri
Binary Mode Source Mode
Bytes: 12
States: 45
Hex Code in: Binary Mode = [Encoding]
Source Mode = [A5][Encoding]
Operation: XCH
(A) → ← ((Ri))
XCH A,Rn
Binary Mode Source Mode
Bytes: 12
States: 34
Hex Code in: Binary Mode = [Encoding]
Source Mode = [A5][Encoding]
Operation: XCH
(A) → ← (Rn)
Variations
XCHD A,@Ri
Function: Exchange digit
Description: Exchanges the low nibble of the accumulator (bits 3-0), generally representing a
hexadecimal or BCD digit, with that of the on-chip RAM location indirectly addressed by the
specified register. Does not affect the high nibble (bits 7-4) of either register.
Flags:
Example: R0 contains the address 20H, the accumulator contains 36H (00110110B), and on-chip RAM
location 20H contains 75H (01110101B). After executing the instruction
XCHD A,@R0
on-chip RAM location 20H contains 76H (01110110B) and 35H (00110101B) in the accumu-
lator.
[Encoding] 1 1 0 0 0 1 1 i
[Encoding] 1 1 0 0 1 r r r
CY AC OV N Z
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