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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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18F8680 датащи(PDF) 98 Page - Microchip Technology |
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18F8680 датащи(HTML) 98 Page - Microchip Technology |
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98 / 496 page  PIC18F6585/8585/6680/8680 DS30491C-page 96 2004 Microchip Technology Inc. 6.2 16-bit Mode The external memory interface implemented in PIC18F8X8X devices operates only in 16-bit mode. The mode selection is not software configurable but is programmed via the configuration bits. The WM<1:0> bits in the MEMCON register determine three types of connections in 16-bit mode. They are referred to as: • 16-bit Byte Write • 16-bit Word Write • 16-bit Byte Select These three different configurations allow the designer maximum flexibility in using 8-bit and 16-bit memory devices. For all 16-bit modes, the Address Latch Enable (ALE) pin indicates that the Address bits (A<15:0>) are avail- able on the external memory interface bus. Following the address latch, the Output Enable signal (OE ) will enable both bytes of program memory at once to form a 16-bit instruction word. In Byte Select mode, JEDEC standard Flash memories will require BA0 for the byte address line, and one I/O line to select between Byte and Word mode. The other 16-bit modes do not need BA0. JEDEC standard static RAM memories will use the UB or LB signals for byte selection. 6.2.1 16-BIT BYTE WRITE MODE Figure 6-1 shows an example of 16-bit Byte Write mode for PIC18F8X8X devices. FIGURE 6-1: 16-BIT BYTE WRITE MODE EXAMPLE AD<7:0> A<19:16> ALE D<15:8> 373 A<x:0> D<7:0> A<19:0> A<x:0> D<7:0> 373 OE WRH OE OE WR(1) WR(1) CE CE Note 1: This signal only applies to table writes. See Section 5.1 “Table Reads and Table Writes”. WRL D<7:0> (LSB) (MSB) PIC18F8X8X D<7:0> AD<15:8> Address Bus Data Bus Control Lines CE |
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