AT89LS52-16SC ATMEL [ATMEL Corporation], AT89LS52-16SC Datasheet - Page 9

• Manufacturer Part Number: AT89LS52-16SC
• Description: 8-bit Low-Voltage Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Table 5-3.
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.
2601B–MICRO–03/05
AUXR
–
DISALE
DISRTO
WDIDLE
Reserved for future expansion
DISALE
0
1
DISRTO
0
1
Disable/Enable WDT in IDLE mode
WDIDLE
0
1
Disable/Enable ALE
Disable/Enable Reset out
AUXR: Auxiliary Register
Address = 8EH
Not Bit Addressable
Bit
Operating Mode
ALE is emitted at a constant rate of 1/6 the oscillator frequency
ALE is active only during a MOVX or MOVC instruction
Reset pin is driven High after WDT times out
Reset pin is input only
WDT continues to count in IDLE mode
WDT halts counting in IDLE mode
–
7
–
6
–
5
WDIDLE
4
DISRTO
3
2
–
Reset Value = XXX00XX0B
–
1
AT89LS52
DISALE
0
9