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 

Notes:

1. Logical instructions that affect a bit are in Table 27.

2. A shaded cell denotes an instruction in the C51 Architecture.

3. If this instruction addresses an I/O Port (Px, x = 0-3), add 1 to the number of states. Add 2 if it addresses a Peripheral SFR.

4. If this instruction addresses an I/O Port (Px, x = 0-3), add 2 to the number of states. Add 3 if it addresses a Peripheral SFR.

5. If this instruction addresses external memory location, add N+2 to the number of states (N: number of wait states).

6. If this instruction addresses external memory location, add 2(N+2) to the number of states (N: number of wait states).

Table 23. Summary of Logical Instructions (2/2)

Shift Left LogicalSLL <dest><dest>0 ← 0

<dest>n+1 ← <dest>n, n = 0..msb-1

(CY) ← <dest>msb

Shift Right ArithmeticSRA <dest><dest>msb ← <dest>msb

<dest>n-1 ← <dest>n, n = msb..1

(CY) ← <dest>0

Shift Right LogicalSRL <dest><dest>msb ← 0

<dest>n-1 ← <dest>n, n = msb..1

(CY) ← <dest>0

SwapSWAP AA3:0 A7:4

Mnemonic

<dest>,

<src>(1)

Comments

Binary Mode Source Mode

Bytes States Bytes States

Rm

Shift byte register left through the

MSB

3

2

2

1

SLL

WRj

Shift word register left through the

MSB

3

2

2

1

SRA

Rm

Shift byte register right

WRj

Shift word register right

3

2

2

1

3

2

2

1

Rm

Shift byte register left

SRL

WRj

Shift word register left

3

2

2

1

3

2

2

1

SWAP

A

Swap nibbles within ACC

1

2

1

2

Note: 1. A shaded cell denotes an instruction in the C51 Architecture.

28 AT/TSC8x251G2D

4135F–8051–11/06

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