AT80251G2D-3CSUM(2006) 查看數據表（PDF） - Atmel Corporation

零件编号

产品描述 (功能)

生产厂家

AT80251G2D-3CSUM
(Rev.:2006)

8/16-bit Microcontroller with Serial Communication Interfaces

Atmel Corporation 

AT/TSC8x251G2D

Table 28. Summary of Exchange, Push and Pop Instructions

Exchange bytesXCH A, <src>(A) ↔ src opnd

Exchange DigitXCHD A, <src>(A)3:0 ↔ src opnd3:0

PushPUSH <src>(SP) ← (SP) +1; ((SP)) ← src opnd;

(SP) ← (SP) + size (src opnd) - 1

PopPOP <dest>(SP) ← (SP) - size (dest opnd) + 1;

dest opnd ← ((SP)); (SP) ← (SP) -1

Mnemonic

<dest>,

<src>(1)

Comments

Binary Mode Source Mode

Bytes States Bytes States

A, Rn

ACC and register

1

3

2

4

XCH

A, dir8

ACC and direct address (on-chip

RAM or SFR)

2

3(3)

2

3(3)

A, at Ri

ACC and indirect address

1

4

2

5

XCHD

A, at Ri

dir8

ACC low nibble and indirect address

(256 bytes)

1

4

2

5

Push direct address onto stack

2

2(2)

2

2(2)

#data

Push immediate data onto stack

4

4

3

3

PUSH

#data16

Rm

Push 16-bit immediate data onto

stack

Push byte register onto stack

5

5

4

5

3

4

2

3

WRj

Push word register onto stack

3

5

2

4

DRk

Push double word register onto

stack

3

9

2

8

dir8

Pop direct address (on-chip RAM or

SFR) from stack

2

3(2)

2

3(2)

POP

Rm

Pop byte register from stack

WRj

Pop word register from stack

3

3

2

2

3

5

2

4

DRk

Pop double word register from stack

3

9

2

8

Notes:

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

2. 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.

3. 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.

35

4135F–8051–11/06

Share Link: