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C8051F300 Datasheet(PDF) 62 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 62 Page - List of Unclassifed Manufacturers |
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62 / 174 page  C8051F300/1/2/3/4/5 62 Rev. 2.6 8.2.2. Data Memory The CIP-51 includes 256 bytes of internal RAM mapped into the data memory space from 0x00 through 0xFF. The lower 128 bytes of data memory are used for general purpose registers and scratch pad mem- ory. Either direct or indirect addressing may be used to access the lower 128 bytes of data memory. Loca- tions 0x00 through 0x1F are addressable as four banks of general purpose registers, each bank consisting of eight byte-wide registers. The next 16 bytes, locations 0x20 through 0x2F, may either be addressed as bytes or as 128 bit locations accessible with the direct addressing mode. The upper 128 bytes of data memory are accessible only by indirect addressing. This region occupies the same address space as the Special Function Registers (SFR) but is physically separate from the SFR space. The addressing mode used by an instruction when accessing locations above 0x7F determines whether the CPU accesses the upper 128 bytes of data memory space or the SFRs. Instructions that use direct addressing will access the SFR space. Instructions using indirect addressing above 0x7F access the upper 128 bytes of data memory. Figure 8.3 illustrates the data memory organization of the CIP-51. Figure 8.3. Data Memory Map 8.2.3. General Purpose Registers The lower 32 bytes of data memory, locations 0x00 through 0x1F, may be addressed as four banks of gen- eral-purpose registers. Each bank consists of eight byte-wide registers designated R0 through R7. Only one of these banks may be enabled at a time. Two bits in the program status word, RS0 (PSW.3) and RS1 (PSW.4), select the active register bank (see description of the PSW in SFR Definition 8.4). This allows fast context switching when entering subroutines and interrupt service routines. Indirect addressing modes use registers R0 and R1 as index registers. (Direct and Indirect Addressing) 0x00 0x7F Upper 128 RAM (Indirect Addressing Only) 0x80 0xFF Special Function Register's (Direct Addressing Only) General Purpose Registers 0x1F 0x20 0x2F Bit Addressable Lower 128 RAM (Direct and Indirect Addressing) 0x30 INTERNAL DATA ADDRESS SPACE |
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