UPSD3354DV-40U6 Datasheet, PDF (46/272 Pages) STMicroelectronics – fast 8032 MCU with programmable logic

8032 addressing modes
9
8032 addressing modes
UPSD33xx
The 8032 MCU uses 11 different addressing modes listed below:
● Register
● Direct
● Register Indirect
● Immediate
● External Direct
● External Indirect
● Indexed
● Relative
● Absolute
● Long
● Bit
t(s) _9.1
Register addressing
uc _{This mode uses the contents of one of the registers R0 - R7 (selected by the last three bits}
rod ^{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:
te ^P _{MOV A, R7}
; Move contents of R7 to accumulator
bsole _9.2
Direct addressing
- ^O 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
t(s ^{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:
roduc ^{MOV A, 40h}
; Move contents of DATA SRAM
; at location 40h into the accumulator
lete ^P 9.3
Register indirect addressing
so _{This mode uses an 8-bit address contained in either register R0 or R1 to indirectly address}
b _{an operand which resides in 8032 IDATA SRAM (internal address range 80h-FFh). Although}
O _{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:
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Doc ID 9685 Rev 7