Samsung 8-Bit Manual do Utilizador descarregar pdf (Página 270)

100

101

ADDRESSING MODES S3C9228/P9228

3-10

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.

Sample Instructions:

LDC R5,1234H ; The values in the program address (1234H)

are loaded into register R5.

LDE R5,1234H ; Identical operation to LDC example, except that

external program memory is accessed.

dst/src

OPCODE

Program Memory

"0" or "1"

Lower Address Byte

LSB Selects Program

Memory or Data Memory:

"0" = Program Memory

"1" = Data Memory

Memory

Address

Used

Upper Address Byte

Program or

Data Memory

Figure 3-10. Direct Addressing for Load Instructions

1 2 ... 265 266 267 268 269 270 271 272 273 274 275 ... 461 462

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