at89lp2052-20xi ATMEL Corporation, at89lp2052-20xi Datasheet - Page 5

• Manufacturer Part Number: at89lp2052-20xi
• Description: At89lp2052 8-bit Microcontroller With 2/4-kbyte Flash
• Manufacturer: ATMEL Corporation

5.2
3547H–MICRO–5/07
Data Memory
Figure 5-1.
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
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.
Upper
Lower
128
128
FFH
7FH
80H
0
0000
07FF
Program Memory Map
Data Memory Map
By Direct and
Addressing
Addressing
By Indirect
Accessible
Accessible
Program Memory
Indirect
Only
AT89LP2052
Figure
5-2). The upper 128 bytes of data memory may only
Addressing
Accessible
By Direct
0000
0FFF
Special
Function
Registers
AT89LP2052/LP4052
Program Memory
AT89LP4052
FFH
80H
Ports
Status and
Control Bits
Timers
Registers
Stack Pointer
Accumulator
(Etc.)
5