UPSD3422 datasheet(38/293 Pages) STMICROELECTRONICS

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8032 addressing modes

uPSD34xx

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8032 addressing modes

The 8032 MCU uses 11 different addressing modes listed below:

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Direct

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Immediate

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External Direct

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External Indirect

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Indexed

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Relative

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Absolute

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Long

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Bit

9.1

This mode uses the contents of one of the registers R0 - R7 (selected by the last three bits

in the instruction opcode) as the operand source or destination. This mode is very efficient

since an additional instruction byte is not needed to identify the operand. For example:

9.2

Direct Addressing

This mode uses an 8-bit address, which is contained in the second byte of the instruction, to

directly address an operand which resides in either 8032 DATA SRAM (internal address

range 00h-07Fh) or resides in 8032 SFR (internal address range 80h-FFh). This mode is

quite fast since the range limit is 256 bytes of internal 8032 SRAM. For example:

9.3

This mode uses an 8-bit address contained in either Register R0 or R1 to indirectly address

an operand which resides in 8032 IDATA SRAM (internal address range 80h-FFh). Although

8032 SFR registers also occupy the same physical address range as IDATA, SFRs will not

be accessed by Register Indirect mode. SFRs may only be accesses using Direct address

mode. For example:

MOV A, R7

; Move contents of R7 to accumulator

MOV A, 40h

; Move contents of DATA SRAM

; at location 40h into the accumulator

MOV A, @R0

; Move into the accumulator the

; contents of IDATA SRAM that is

; pointed to by the address

; contained in R0.

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