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AT89S52-24PU Datasheet(PDF) 9 Page - ATMEL Corporation

Part No. AT89S52-24PU
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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9
1919D–MICRO–6/08
AT89S52
Dual Data Pointer Registers: To facilitate accessing both internal and external data memory, two banks of 16-bit Data
Pointer Registers are provided: DP0 at SFR address locations 82H-83H and DP1 at 84H-85H. Bit DPS = 0 in SFR AUXR1
selects DP0 and DPS = 1 selects DP1. The user should ALWAYS initialize the DPS bit to the appropriate value before
accessing the respective Data Pointer Register.
Power Off Flag: The Power Off Flag (POF) is located at bit 4 (PCON.4) in the PCON SFR. POF is set to “1” during power
up. It can be set and rest under software control and is not affected by reset.
Table 5-3.
AUXR: Auxiliary Register
AUXR
Address = 8EH
Reset Value = XXX00XX0B
Not Bit Addressable
–
–
–
WDIDLE
DISRTO
–
–
DISALE
Bit
765
4
3
2
1
0
–
Reserved for future expansion
DISALE
Disable/Enable ALE
DISALE
Operating Mode
0
ALE is emitted at a constant rate of 1/6 the oscillator frequency
1
ALE is active only during a MOVX or MOVC instruction
DISRTO
Disable/Enable Reset out
DISRTO
0
Reset pin is driven High after WDT times out
1
Reset pin is input only
WDIDLE
Disable/Enable WDT in IDLE mode
WDIDLE
0
WDT continues to count in IDLE mode
1
WDT halts counting in IDLE mode
Table 5-4.
AUXR1: Auxiliary Register 1
AUXR1
Address = A2H
Reset Value = XXXXXXX0B
Not Bit Addressable
–––
–
–
–
–
DPS
Bit
765
4
3
2
1
0
–
Reserved for future expansion
DPS
Data Pointer Register Select
DPS
0
Selects DPTR Registers DP0L, DP0H
1
Selects DPTR Registers DP1L, DP1H




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