S3C9454B View Datasheet(PDF) - Samsung
Part Name
Description
MFG CO.
'S3C9454B' PDF : 199 Pages View PDF
ADDRESSING MODES
S3C9454B/F9454B
DIRECT ADDRESS MODE (DA)
In Direct Address (DA) mode, the instruction provides the operand's 16-bit memory address. Jump (JP) and Call
(CALL) instructions use this addressing mode to specify the 16-bit destination address that is loaded into the PC
whenever a JP or CALL instruction is executed.
The LDC and LDE instructions can use Direct Address mode to specify the source or destination address for Load
operations to program memory (LDC) or to external data memory (LDE), if implemented.
Program or
Data Memory
Program Memory
Upper Address Byte
Lower Address Byte
dst/src "0" or "1"
OPCODE
Memory
Address
Used
LSB Selects Program
Memory or Data Memory:
"0" = Program Memory
"1" = Data Memory
Sample Instructions:
LDC
LDE
R5,1234H ;
R5,1234H ;
The values in the program address (1234H)are loaded
into register R5.
Identical operation to LDC example, except that
external program memory is accessed.
Figure 3-10. Direct Addressing for Load Instructions
3-10
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