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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMP93CS44 датащи(PDF) 55 Page - Toshiba Semiconductor |
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TMP93CS44 датащи(HTML) 55 Page - Toshiba Semiconductor |
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55 / 224 page  TMP93CS44/S45 2004-02-10 93CS44-53 3.5 3.5.1 Port 0 (P00 to P07) Port 0 is an 8-bit general-purpose I/O port. I/O can be set on a bit basis using the control register P0CR. Resetting sets all bits of P0CR to 0 and sets port 0 to input mode. Figure 3.5.3 shows the registers for port 0. In addition to functioning as a general-purpose I/O port, port 0 also shares functions as an address data bus (AD0 to AD7). To access external memory, port 0 functions as an address data bus (AD0 to AD7) and all bits of the control register P0CR are set to 0. With the TMP93CS45, which needs external ROMs, port 0 always functions as an address data bus (AD0 to AD7) regardless of the value set in control register P0CR. Figure 3.5.1 Port 0 Direction control (on bit basis) Reset P0CR write Output latch P0 write S B Selector A P0 read Output buffer Port 0 P00 to P07 (AD0 to AD7) Selector A S B |
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