DR805X Datasheet, PDF(54/79 Page) Digital Core Design – 8-bit RISC Microcontroller Instructions set details ver 3.10

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DR805X Datasheet, PDF (54/79 Pages) Digital Core Design – 8-bit RISC Microcontroller Instructions set details ver 3.10

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DR805x Instructions set details

3.25. MOVC

- 54 -

Instruction: MOVC A, @A + <base-reg>

Function: Move code byte

Description:

The MOVC instructions load the accumulator with a code byte, or

constant from program memory. The address of the byte fetched is the

sum of the original unsigned eight-bit accumulator contents and the

contents of a sixteen-bit base register, which may be either the data

pointer or the PC. In the latter case, the PC is incremented to the

address of the following instruction before being added to the

accumulator; otherwise the base register is not altered. Sixteen-bit

addition is performed so a carry-out from the low-order eight bits may

propagate through higher-order bits. No flags are affected.

3.25.1.

MOVC A, @A + DPTR

Operation: (PC) â (PC) + 1

(A) â ((A) + (DPTR))

Bytes:

Cycles:

Encoding:

10010011

3.25.2.

MOVC A, @A + PC

Operation: (PC) â (PC) + 1

(A) â ((A) + (PC))

Bytes:

Cycles:

Encoding:

10000011

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