at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 26

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

26
AT89C51RE2
Reset Value = 00XX 00X0b
Not bit addressable
Number
Bit
5
4
3
2
1
0
Mnemonic Description
DPS
GF2
Bit
U2
0
-
-
P4 bit addressable
Clear to map SCON_1 register at C0h sfr address
Set to map P4 port register at C0h address.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
This bit is a general purpose user flag. *
Always cleared.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Data Pointer Selection
Cleared to select DPTR0.
Set to select DPTR1.
7663B–8051–03/07