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AT89LP213 Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT89LP213 Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 98 page  8 3538D–MICRO–10/09 AT89LP213/214 A map of the AT89LP213/214 program memory is shown in Figure 6-1. In addition to the 2K code space from 0000h to 07FFh, the AT89LP213/214 also supports a 64-byte User Signature Array and a 32-byte Atmel Signature Array that are accessible by the CPU in a read-only fash- ion. In order to read from the signature arrays, the SIGEN bit in AUXR1 must be set. While SIGEN is one, MOVC A,@A+DPTR will access the signature arrays. The User Signature Array is mapped to addresses 0040h to 007Fh and the Atmel Signature Array is mapped to addresses 0000h to 001Fh. SIGEN must be cleared before using MOVC to access the code memory. The Atmel Signature Array is initialized with the Device ID in the factory. The User Signature Array is available for user identification codes or constant parameter data. Data stored in the sig- nature array is not secure. Security bits will disable writes to the array; however, reads are always allowed. 6.2 Data Memory The AT89LP213/214 contains 128 bytes of general SRAM data memory plus 128 bytes of I/O memory 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 AT89LP213/214 does not support external data memory. Figure 6-2. Data Memory Map Table 6-1. AUXR1 – Auxiliary Register 1 AUXR1 = A2H Reset Value = XXXX 0XXXB Not Bit Addressable –––– SIGEN ––– Bit 76543 210 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.) |
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