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AT89LP216 Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT89LP216 Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 96 page  7 3621C–MICRO–6/08 AT89LP216 6.2 Data Memory The AT89LP216 contains 128 bytes of general SRAM data memory plus 128 bytes of I/O mem- ory mapped into a single 8-bit address space. The 128 bytes of data memory may be accessed through both direct and indirect addressing of the lower 128 byte addresses. The 128 bytes of I/O memory reside in the upper 128 byte address space (Figure 6-2). The I/O memory can only be accessed through direct addressing and contains the Special Function Registers (SFRs). Indirect accesses to the upper 128 byte addresses will return invalid data. 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 AT89LP216 does not support external data memory. Figure 6-2. Data Memory Map FFH UPPER 128 80H 7F H LO WER 128 0 Accessible By Direct Addressing Only Accessible By Direct and Indirect Addressing Only Special Function Registers Ports Status and Control Bits Timers Registers Stack Pointer Accumulator (Etc.) |
Similar Part No. - AT89LP216_08 |
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Similar Description - AT89LP216_08 |
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