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ATMEGA128A Scheda tecnica(PDF) 14 Page - ATMEL Corporation |
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ATMEGA128A Scheda tecnica(HTML) 14 Page - ATMEL Corporation |
14 / 386 page 14 8151G–AVR–07/10 ATmega128A 6.6.1 SPH and SPL - Stack Pointer High and Low Register 6.6.2 RAMPZ - RAM Page Z Select Register • Bits 7:1 – Reserved These are reserved bits and will always read as zero. When writing to this address location, write these bits to zero for compatibility with future devices. • Bit 0 – RAMPZ0: Extended RAM Page Z-pointer The RAMPZ Register is normally used to select which 64K RAM Page is accessed by the Z- pointer. As the ATmega128A does not support more than 64K of SRAM memory, this register is used only to select which page in the program memory is accessed when the ELPM/SPM instruction is used. The different settings of the RAMPZ0 bit have the following effects: Note that LPM is not affected by the RAMPZ setting. 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 6-4 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. Bit 15141312 1110 9 8 SP15 SP14 SP13 SP12 SP11 SP10 SP9 SP8 SPH 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/WR/W R/WR/W R/WR/W R/W R/W Initial Value 0 0 000000 00 000000 Bit 7 6 543 2 1 0 – – – – – – – RAMPZ0 RAMPZ Read/Write R R R R R R R R/W Initial Value 0 0 0 0 0 0 0 0 RAMPZ0 = 0: Program memory address $0000 - $7FFF (lower 64 Kbytes) is accessed by ELPM/SPM RAMPZ0 = 1: Program memory address $8000 - $FFFF (higher 64 Kbytes) is accessed by ELPM/SPM |
Codice articolo simile - ATMEGA128A_1 |
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Descrizione simile - ATMEGA128A_1 |
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