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 

Table 16. Notation for Immediate Addressing

Immediate

Address Description

C251 C51

#data

An 8-bit constant that is immediately addressed in an instruction

3

3

#data16

A 16-bit constant that is immediately addressed in an instruction

3

–

#0data16

#1data16

A 32-bit constant that is immediately addressed in an instruction. The

upper word is filled with zeros (#0data16) or ones (#1data16).

3

–

#short

A constant, equal to 1, 2, or 4, that is immediately addressed in an

instruction.

3

–

Table 17. Notation for Bit Addressing

Direct

Address

Description

C251 C51

bit51

A directly addressed bit (bit number = 00h-FFh) in memory or an

SFR. Bits 00h-7Fh are the 128 bits in byte locations 20h-2Fh in the

on-chip RAM. Bits 80h-FFh are the 128 bits in the 16 SFRs with

addresses that end in 0h or 8h, S:80h, S:88h, S:90h,..., S:F0h,

–

3

S:F8h.

bit

A directly addressed bit in memory locations 00:0020h-00:007Fh or

in any defined SFR.

3

Table 18. Notation for Destination in Control Instructions

Direct

Address

Description

C251 C51

rel

A signed (two’s complement) 8-bit relative address. The destination

is -128 to +127 bytes relative to the next instruction’s first byte.

3

3

addr11

An 11-bit target address. The target is in the same 2-Kbyte block of

memory as the next instruction’s first byte.

–

3

addr16

A 16-bit target address. The target can be anywhere within the same

64-Kbyte region as the next instruction’s first byte.

–

3

addr24

A 24-bit target address. The target can be anywhere within the 16-

Mbyte address space.

3

–

22 AT/TSC8x251G2D

4135F–8051–11/06

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