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TMP93CS44 датащи(PDF) 56 Page - Toshiba Semiconductor |
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TMP93CS44 датащи(HTML) 56 Page - Toshiba Semiconductor |
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56 / 224 page ![]() TMP93CS44/S45 2004-02-10 93CS44-54 3.5.2 Port 1 (P10 to P17) Port 1 is an 8-bit general-purpose I/O port. I/O can be set on a bit basis using control register P1CR and function register P1FC. Resetting sets all bits of output latch P1, control register P1CR, and function register P1FC to 0 and sets port 1 to input mode. Figure 3.5.3 shows the registers for port 1. In addition to functioning as a general-purpose I/O port, port 1 also shares functions as an address data bus (AD8 to AD15) or an address bus (A8 to A15). With the TMP93CS45, which needs external ROMs, port 1 always functions as an address data bus (AD8 to AD15) (the case of AM8/ AM16 = 0), as an address bus (A8 to A15) (the case of AM8/ AM16 = 1) regardless of the value set in control register P1CR. Figure 3.5.2 Port 1 Direction control (on bit basis) Reset P1CR write Output latch P1 write S B Selector A P1 read Output buffer Port 1 P10 to P17 (AD8 to AD15/A8 to A15) Function control (on bit basis) P1FC write |
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