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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ATmega325P Arkusz danych(PDF) 16 Page - ATMEL Corporation |
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ATmega325P Arkusz danych(HTML) 16 Page - ATMEL Corporation |
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16 / 364 page  16 8023F–AVR–07/09 ATmega325P/3250P 6.6.1 SPH and SPL – Stack Pointer High and Stack Pointer Low 6.7 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 1 shows the parallel instruction fetches and instruction executions enabled by the Har- vard architecture and the fast-access Register File concept. This is the basic pipelining 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. Figure 1. The Parallel Instruction Fetches and Instruction Executions Figure 2 shows the internal timing concept for the Register File. In a single clock cycle an ALU operation using two register operands is executed, and the result is stored back to the destina- tion register. Figure 2. Single Cycle ALU Operation Bit 151413121110 9 8 0x3E (0x5E) SP15 SP14 SP13 SP12 SP11 SP10 SP9 SP8 SPH 0x3D (0x5D) SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SPL 76 543210 Read/Write 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 R/W R/W R/W Initial Value 0 0 000000 00 000000 clk 1st Instruction Fetch 1st Instruction Execute 2nd Instruction Fetch 2nd Instruction Execute 3rd Instruction Fetch 3rd Instruction Execute 4th Instruction Fetch T1 T2 T3 T4 CPU Total Execution Time Register Operands Fetch ALU Operation Execute Result Write Back T1 T2 T3 T4 clk CPU |
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