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8051 Registers Guide
1.
8051 REGISTERS
2.
On-Chip Memory Internal
RAM
3.
Registers 07 06
05 04 03 02 01 00 R7 R6 R5 R4 R3 R2 R1 R0 0F 08 17 10 1F 18 Bank 3 Bank 2 Bank 1 Bank 0 Four Register Banks Each bank has R0-R7 Selectable by psw.2,3
4.
Bit Addressable Memory
20h – 2Fh (16 locations X 8-bits = 128 bits) 27 26 25 24 23 22 21 20 2F 2E 2D 2C 2B 2A 29 28 7F 78 1A 10 0F 08 07 06 05 04 03 02 01 00
5.
6.
7.
8.
A B R0
R1 R3 R4 R2 R5 R7 R6 DPH DPL PC DPTR PC Some 8051 16-bit Register Some 8-bit Registers of the 8051
9.
PROGRAM STATUS WORD
10.
11.
12.
TCON: Timer/Counter Control
Register (bit addressable)
13.
TMOD: Timer/Counter Mode
Control Register (not bit addressable )
14.
15.
16.
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