AT87251G2D-3CSUM【PDF 19/77 页】IC 8051 MCU 32K OTP 24MHZ 40DIP

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AT/TSC8x251G2D

4135F–8051–11/06

Table 22.

Summary of Compare Instructions

Notes: 1. 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.

2. If this instruction addresses external memory location, add N+2 to the number of

states (N: number of wait states).

3. If this instruction addresses external memory location, add 2(N+2) to the number of

states (N: number of wait states).

CompareCMP <dest>, <src>dest opnd - src opnd

Mnemonic

<dest>,

<src>

(2)

Comments

Binary Mode

Source Mode

Bytes

States

Bytes

States

CMP

Rmd, Rms

WRjd,

WRjs

Word register with word register

DRkd,

DRks

Dword register with dword register

Rm, #data

WRj,

#data16

Word register with immediate 16-bit data

DRk,

#0data16

Dword register with zero-extended 16-bit

immediate data

645

DRk,

#1data16

Dword register with one-extended 16-bit

immediate data

645

Rm, dir8

Direct address (on-chip RAM or SFR) with

byte register

43(1)

32(1)

WRj, dir8

Direct address (on-chip RAM or SFR) with

word register

433

Rm, dir16

Direct address (64K) with byte register

3(2)

42(2)

WRj, dir16

Direct address (64K) with word register

4(3)

43(3)

Rm, at WRj Indirect address (64K) with byte register

3(2)

32(2)

Rm, at DRk Indirect address (16M) with byte register

4(2)

33(2)

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