Specifications

150
3706C–MICRO–2/11
AT89LP3240/6440
22.1.7 LSL M
Function: Shift MAC Accumulator Left Logically
Description: The forty bits in the M register are shifted one bit to the left. Bit 0 is cleared. No flags are affected.
Example: The M register holds the value 0C5B1A29384H. The following instruction,
LSL M
leaves the M register holding the value 8B63452708H.
Bytes: 2
Cycles: 2
Encoding: A5 00100011
Operation: LSL
(M
n+1
) ← (M
n
) n = 0 - 38
(M
0
) ← 0
22.1.8 MOVC A, @A+/DPTR
Function: Move code byte relative to Alternate Data Pointer
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 8-bit Accumulator contents and the contents of the
unselected Data Pointer. The base register is not altered. Sixteen-bit addition is performed so a carry-o
ut from
the low-order eight bits may propagate through higher-order bits. No flags are affected.
Example: A value between 0 and 3 is in the Accumulator. The following instructions will translate the value in the
Accumulator to one of four values defined by the DB (define byte) directive.
MOV /DPTR, #TABLE
MOVC A, @A+PC
RET
TABLE:
DB 66H
DB 77H
DB 88H
DB 99H
If the subroutine is called with the Accumu
lator equal to 01H, it returns with 77H in the Accumulator.
Bytes: 2
Cycles: 4
Encoding: A5 10010011
Operation: MOVC
IF (DPS) = 0
THEN
(A) ← ( (A) + (DPTR1) )
ELSE
(A) ← ( (A) + (DPTR0) )