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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATmega1284P 데이터시트(PDF) 12 Page - ATMEL Corporation |
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ATmega1284P 데이터시트(HTML) 12 Page - ATMEL Corporation |
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12 / 380 page  12 8059D–AVR–11/09 ATmega1284P 5.5.1 SPH and SPL – Stack Pointer High and Stack pointer Low 5.5.2 RAMPZ – Extended Z-pointer Register for ELPM/SPM For ELPM/SPM instructions, the Z-pointer is a concatenation of RAMPZ, ZH, and ZL, as shown in Figure 5-4. Note that LPM is not affected by the RAMPZ setting. Figure 5-4. The Z-pointer used by ELPM and SPM The actual number of bits is implementation dependent. Unused bits in an implementation will always read as zero. For compatibility with future devices, be sure to write these bits to zero. 5.6 Instruction Execution Timing This section describes the general access timing concepts for instruction execution. The AVR CPU is driven by the CPU clock clk CPU, directly generated from the selected clock source for the chip. No internal clock division is used. Figure 5-5 on page 13 shows the parallel instruction fetches and instruction executions enabled by the Harvard architecture and the fast-access Register File concept. This is the basic pipelin- ing concept to obtain up to 1 MIPS per MHz with the corresponding unique results for functions per cost, functions per clocks, and functions per power-unit. Bit 151413121110 9 8 0x3E (0x5E) – – – SP12 SP11 SP10 SP9 SP8 SPH 0x3D (0x5D) SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SPL 765 432 10 Read/Write R R R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 1 0 0 0 0 111 111 11 Bit 7 65432 1 0 0x3B (0x5B) RAMPZ7 RAMPZ6 RAMPZ5 RAMPZ4 RAMPZ3 RAMPZ2 RAMPZ1 RAMPZ0 RAMPZ Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 00000 0 0 Bit ( Individually) 70 7 0 7 0 RAMPZ ZH ZL Bit (Z-pointer) 23 16 15 8 7 0 |
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