AT89LP4052(2008) View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89LP4052 Datasheet PDF : 93 Pages
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Figure 5-1. Program Memory Map
AT89LP2052/LP4052
0FFF
07FF
0000
Program Memory
AT89LP2052
Program Memory
AT89LP4052
0000
5.2 Data Memory
The AT89LP2052/LP4052 contains 256 bytes of general SRAM data memory plus 128 bytes of
I/O memory. The lower 128 bytes of data memory may be accessed through both direct and
indirect addressing. The upper 128 bytes of data memory and the 128 bytes of I/O memory
share the same address space (see Figure 5-2). The upper 128 bytes of data memory may only
be accessed using indirect addressing. The I/O memory can only be accessed through direct
addressing and contains the Special Function Registers (SFRs). The lowest 32 bytes of data
memory are grouped into 4 banks of 8 registers each. The RS0 and RS1 bits (PSW.3 and
PSW.4) select which register bank is in use. Instructions using register addressing will only
access the currently specified bank. The AT89LP2052/LP4052 does not support external data
memory.
Figure 5-2. Data Memory Map
FFH
Upper
128
80H
7FH
Lower
128
Accessible
By Indirect
Addressing
Only
Accessible
By Direct and
Indirect
Addressing
0
FFH
Accessible
By Direct
Addressing
80H
Special
Function
Registers
Ports
Status and
Control Bits
Timers
Registers
Stack Pointer
Accumulator
(Etc.)
5
3547I–MICRO–6/08
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