UPSD3212A(2009) 查看數據表（PDF） - STMicroelectronics

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UPSD3212A
(Rev.:2009)

Flash programmable system devices with 8032 MCU and USB and programmable logic

STMicroelectronics 

UPSD3212A, UPSD3212C, UPSD3212CV

Architecture overview

2.8

2.8.1

Addressing modes

The addressing modes in UPSD321xx devices instruction set are as follows

1. Direct addressing

2. Indirect addressing

3. Register addressing

4. Register-specific addressing

5. Immediate constants addressing

6. Indexed addressing

Direct addressing

In a direct addressing the operand is specified by an 8-bit address field in the instruction.

Only internal Data RAM and SFRs (80~FFH RAM) can be directly addressed.

Example:

mov A, 3EH ; A <----- RAM[3E]

Figure 10. Direct addressing

Program Memory

3Eh

04

A

2.8.2

AI06641

Indirect addressing

In indirect addressing the instruction specifies a register which contains the address of the

operand. Both internal and external RAM can be indirectly addressed. The address register

for 8-bit addresses can be R0 or R1 of the selected register bank, or the Stack Pointer. The

address register for 16-bit addresses can only be the 16-bit “data pointer” register, DPTR.

Example:

mov @R1, #40 H ;[R1] <-----40H

Figure 11. Indirect addressing

Program Memory

55h 40h

R1

55

AI06642

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