UPSD3313DV-40T6 datasheet(30/231 Pages) STMICROELECTRONICS

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uPSD33xx

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8032 ADDRESSING MODES

The 8032 MCU uses 11 different addressing

modes listed below:

■

Direct

■

Immediate

■

External Direct

■

External Indirect

■

Indexed

■

Relative

■

Absolute

■

Long

■

Bit

This mode uses the contents of one of the regis-

ters R0 - R7 (selected by the last three bits in the

instruction opcode) as the operand source or des-

tination. This mode is very efficient since an addi-

tional instruction byte is not needed to identify the

operand. For example:

Direct Addressing

This mode uses an 8-bit address, which is con-

tained in the second byte of the instruction, to di-

rectly 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:

This mode uses an 8-bit address contained in ei-

ther Register R0 or R1 to indirectly address an op-

erand which resides in 8032 IDATA SRAM

(internal address range 80h-FFh). Although 8032

SFR registers also occupy the same physical ad-

dress range as IDATA, SFRs will not be accessed

by Register Indirect mode. SFRs may only be ac-

cesses using Direct address mode. For example:

Immediate Addressing

This mode uses 8-bits of data (a constant) con-

tained in the second byte of the instruction, and

stores it into the memory location or register indi-

cated by the first byte of the instruction. Thus, the

data is immediately available within the instruction.

This mode is commonly used to initialize registers

and SFRs or to perform mask operations.

There is also a 16-bit version of this mode for load-

ing the DPTR Register. In this case, the two bytes

following the instruction byte contain the 16-bit val-

ue. For example:

External Direct Addressing

This mode will access external memory (XDATA)

by using the 16-bit address stored in the DPTR

mode and both use the accumulator to either re-

ceive a byte from external memory addressed by

DPTR or to send a byte from the accumulator to

the address in DPTR. The uPSD33xx has a spe-

cial feature to alternate the contents (source and

destination) of DPTR rapidly to implement very ef-

ficient memory-to-memory transfers. For example:

Note:

See

details

DUAL

DATA

POINTERS, page 37.

External Indirect Addressing

This mode will access external memory (XDATA)

by using the 8-bit address stored in either Register

R0 or R1. This is the fastest way to access XDATA

(least bus cycles), but because only 8-bits are

available for address, this mode limits XDATA to a

size of only 256 bytes (the traditional Port 2 of the

8032 MCU is not available in the uPSD33xx, so it

is not possible to write the upper address byte).

This mode is not supported by uPSD33xx.

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.

MOV A, 40#

; Move the constant, 40h, into

; the accumulator

MOV DPTR, 1234# ; Move the constant, 1234h, into

; DPTR

MOVX A, @DPTR ; Move contents of accumulator to

; XDATA at address contained in

; DPTR

MOVX @DPTR, A ; Move XDATA to accumulator

MOVX @R0,A

; Move into the accumulator the

; XDATA that is pointed to by

; the address contained in R0.

UPSD3313DV-40T6 Datasheet(PDF) 30 Page - STMicroelectronics

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