KS57C2308/P2308/C2316/P2316 SAM47 INSTRUCTION SET
5-69
LDI — Load Data Memory and Increment
LDI dst,src
Operation: Operand Operation Summary Bytes Cycles
A,@HL Load indirect data memory to A; increment register L
contents and skip on overflow 12 + S
Description: The contents of a data memory location are loaded into the accumulator, and the contents of the
register L are incremented by one. If an overflow occurs (e.g., if the resulting value in register L
is 0H), the next instruction is skipped. The contents of data memory and the carry flag value are
not affected.
Operand Binary Code Operation Notation
A,@HL 10001010A ← (HL), then L ← L+1;
skip if L = 0H
Example: Assume that register pair HL contains the address 2FH and internal RAM location 2FH contains
the value 0FH:
LD HL,#2FH
LDI A,@HL ;A ← (HL) and L ← L+1
JPS XXX ;Skip
JPS YYY ;H ← 2H and L ← 0H
The instruction “JPS XXX” is skipped since an overflow occurred after the “LDI A,@HL” and the
instruction “JPS YYY” is executed.