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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT83SND2CMP3B датащи(PDF) 24 Page - ATMEL Corporation |
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AT83SND2CMP3B датащи(HTML) 24 Page - ATMEL Corporation |
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24 / 241 page  24 4341F–MP3–03/06 AT8xC51SND2C/MP3B 7. Data Memory The AT8xC51SND2C provides data memory access in 2 different spaces: 1. The internal space mapped in three separate segments: – The lower 128 Bytes RAM segment – The upper 128 Bytes RAM segment – The expanded 2048 Bytes RAM segment 2. The external space. A fourth internal segment is available but dedicated to Special Function Registers, SFRs, (addresses 80h to FFh) accessible by direct addressing mode. For information on this segment, refer to the Section “Special Function Registers”, page 31. Figure 7-1 shows the internal and external data memory spaces organization. Figure 7-1. Internal and External Data Memory Organization 7.1 Internal Space 7.1.1 Lower 128 Bytes RAM The lower 128 Bytes of RAM (see Figure 7-2) are accessible from address 00h to 7Fh using direct or indirect addressing modes. The lowest 32 Bytes are grouped into 4 banks of 8 registers (R0 to R7). 2 bits RS0 and RS1 in PSW register (see Table 7-4) select which bank is in use according to Table 7-1. This allows more efficient use of code space, since register instructions are shorter than instructions that use direct addressing, and can be used for context switching in interrupt service routines. Table 7-1. Register Bank Selection 2K Bytes Upper 128 Bytes Internal RAM Lower 128 Bytes Internal RAM Special Function Registers 80h 80h 00h 7FFh FFh 00h FFh 64K Bytes External XRAM 0000h FFFFh Direct Addressing Addressing 0800h 7Fh Internal ERAM Direct or Indirect Indirect Addressing EXTRAM = 0 EXTRAM = 1 RS1 RS0 Description 0 0 Register bank 0 from 00h to 07h 0 1 Register bank 1 from 08h to 0Fh 1 0 Register bank 2 from 10h to 17h 1 1 Register bank 3 from 18h to 1Fh |
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