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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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H8S2245 датащи(PDF) 112 Page - Renesas Technology Corp |
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H8S2245 датащи(HTML) 112 Page - Renesas Technology Corp |
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112 / 818 page  Section 2 CPU Rev.3.00 Mar. 26, 2007 Page 70 of 772 REJ09B0355-0300 To switch P14 from being an output pin to being an input pin, we must change the value of P1DDR bit 4 from 1 to 0 (H'F0 → H'E0). Here, were execute a BCLR instruction for RAM0. BCLR #4, @RAM0 P17 P16 P15 P14 P13 P12 P11 P10 I/O Output Output Output Output Input Input Input Input P1DDR 1 1 1 1 0 0 0 0 RAM0 1 1 1 00 000 Since RAM0 can be read and written, when the bit manipulation instruction is executed, only bit 4 in RAM0 is cleared. Then we write this RAM0 value to P1DDR. MOV.B @RAM0, R0L MOV.B R0L, @P1DDR P17 P16 P15 P14 P13 P12 P11 P10 I/O Output Output Output Input Input Input Input Input P1DDR 1 1 1 00 000 RAM0 1 1 1 00 000 If this procedure is used to write registers that include write-only bits, programs can be written without depending on the type of the instructions used. |
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