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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89LP2052 датащи(PDF) 5 Page - ATMEL Corporation |
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AT89LP2052 датащи(HTML) 5 Page - ATMEL Corporation |
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5 / 90 page  5 3547F–MICRO–6/06 AT89LP2052/LP4052 Figure 5-1. Program Memory Map 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 Program Memory AT89LP2052 0000 07FF 0000 0FFF Program Memory AT89LP4052 FFH Upper 128 80H 7FH Lower 128 0 Accessible By Indirect Addressing Only FFH 80H Special Function Registers Ports Status and Control Bits Registers Stack Pointer Accumulator (Etc.) Timers Accessible By Direct and Indirect Addressing Accessible By Direct Addressing |
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