AT80251G2D-3CSUM(2006) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT80251G2D-3CSUM
(Rev.:2006)

8/16-bit Microcontroller with Serial Communication Interfaces

Atmel Corporation 

AT/TSC8x251G2D

Table 19. Notation for Register Operands

Register Description

C251 C51

at Ri

A memory location (00h-FFh) addressed indirectly via byte registers

R0 or R1

–

3

Rn

Byte register R0-R7 of the currently selected register bank

n

Byte register index: n = 0-7

–

3

Rm

Rmd

Rms

m, md, ms

Byte register R0-R15 of the currently selected register file

Destination register

Source register

Byte register index: m, md, ms = 0-15

–

3

Word register WR0, WR2, ..., WR30 of the currently selected register

WRj

file

WRjd

Destination register

WRjs

Source register

at WRj

A memory location (00:0000h-00:FFFFh) addressed indirectly

through word register WR0-WR30, is the target address for jump

–

instructions.

at WRj +dis16 A memory location (00:0000h-00:FFFFh) addressed indirectly

3

j, jd, js

through word register (WR0-WR30) + 16-bit signed (two’s

complement) displacement value

Word register index: j, jd, js = 0-30

Dword register DR0, DR4, ..., DR28, DR56, DR60 of the currently

DRk

selected register file

DRkd

Destination register

DRks

Source register

at DRk

A memory location (00:0000h-FF:FFFFh) addressed indirectly

through dword register DR0-DR28, DR56 and DR60, is the target

–

address for jump instruction

at DRk +dis16 A memory location (00:0000h-FF:FFFFh) addressed indirectly

3

k, kd, ks

through dword register (DR0-DR28, DR56, DR60) + 16-bit (two’s

complement) signed displacement value

Dword register index: k, kd, ks = 0, 4, 8..., 28, 56, 60

23

4135F–8051–11/06

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