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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA640 датащи(PDF) 27 Page - Microchip Technology |
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ATMEGA640 датащи(HTML) 27 Page - Microchip Technology |
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27 / 436 page  27 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A 9. External Memory Interface With all the features the External Memory Interface provides, it is well suited to operate as an interface to memory devices such as External SRAM and Flash, and peripherals such as LCD-display, A/D, and D/A. The main features are: • Four different wait-state settings (including no wait-state) • Independent wait-state setting for different External Memory sectors (configurable sector size) • The number of bits dedicated to address high byte is selectable • Bus keepers on data lines to minimize current consumption (optional) 9.1 Overview When the eXternal MEMory (XMEM) is enabled, address space outside the internal SRAM becomes available using the dedicated External Memory pins (see Figure 1-3 on page 4, Table 13-3 on page 75, Table 13-9 on page 79, and Table 13-21 on page 86). The memory configuration is shown in Figure 9-1. Figure 9-1. External Memory with Sector Select 9.1.1 Using the External Memory Interface The interface consists of: • AD7:0: Multiplexed low-order address bus and data bus A15:8: High-order address bus (configurable number of bits) • ALE: Address latch enable •RD: Read strobe •WR: Write strobe Memory Configuration A 0x0000 0x21FF External Memory (0 - 60K x 8) 0xFFFF Internal memory SRL[2..0] SRW11 SRW10 SRW01 SRW00 Lower sector Upper sector 0x2200 |
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