UPSD3422_V01 datasheet(59/300 Pages) STMICROELECTRONICS

Part #	UPSD3422

Description	Turbo Plus series Fast Turbo 8032 MCU with USB and programmable logic

PDF	300 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

59 / 300 page

Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

UPSD3422, UPSD3433, UPSD3434, UPSD3454

Dual data pointers

59/300

8051 assembly code example

Note:

The code loop where the data transfer takes place is only 3 lines of code.

MOV

R7, #COUNT

; initialize size of data block to transfer

MOV

DPTR,

#SOURCE_ADDR

; load XDATA source address base into DPTR0

MOV

85h, #01h

; load DPTC to access DPTR1 pointer

MOV

DPTR, #DEST_ADDR ; load XDATA destination address base into DPTR1

MOV

85h, #40h

; load DPTC to access DPTR0 pointer and auto

toggle

MOV

86h, #0Ah

; load DPTM to auto-increment both pointers

LOOP:

MOVX(1)

A, @DPTR

; load XDATA byte from source into ACC.

; after load completes, DPTR0 increments and

DPTR

; switches DPTR1

MOVX(1)

@DPTR, A

; store XDATA byte from ACC to destination.

; after store completes, DPTR1 increments and

DPTR

; switches to DPTR0

DJNZ(1)

R7, LOOP

; continue until done

MOV

86h, #00

; disable auto-increment

MOV

85h, #00

; disable auto-toggle, now back to single DPTR

mode

Obsolete

Product(s)

- Obsolete

Product(s)

UPSD3422 Datasheet(PDF) 59 Page - STMicroelectronics

UPSD3422 Datasheet(HTML) 59 Page - STMicroelectronics

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