参数资料
型号: S3P9664-SK
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO20
封装: 0.300 INCH, SOP-20
文件页数: 65/148页
文件大小: 784K
代理商: S3P9664-SK
ADDRESSING MODES
S3C9664/P9664 (Preliminary Spec)
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
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