Intel Embedded Microcontroller, 8XC251SA, 8XC251SP, 8XC251SQ, 8XC251SB manual Acc, F0H

REGISTERS

ACC	Address:	E0H
	Reset State:	0000 0000B

Accumulator. ACC provides SFR access to the accumulator, which resides in the register file as byte register R11 (also named ACC). Instructions in the MCS®51 architecture use the accumulator as both source and destination for calculations and moves. Instructions in the MCS 251 architecture assign no special significance to R11. These instructions can use byte registers Rm (m = 0–15) interchangeably.

7			0
		Accumulator Contents
Bit	Bit	Function
Number	Mnemonic
7:0	ACC.7:0	Accumulator.
B		Address:	F0H
		Reset State:	0000 0000B

B Register. The B register provides SFR access to byte register R10 (also named B) in the register file. The B register is used as both a source and destination in multiply and divide operations. For all other operations, the B register is available for use as one of the byte registers Rm, m = 0–15.

7		0
		B Register Contents
Bit	Bit	Function
Number	Mnemonic
7:0	B.7:0	B Register.

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