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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8S/2218 数据表(PDF) 118 Page - Renesas Technology Corp |
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H8S/2218 数据表(HTML) 118 Page - Renesas Technology Corp |
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118 / 750 page  Section 2 CPU Rev.6.00 Jun. 03, 2008 Page 70 of 698 REJ09B0074-0600 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 1 0 0 0 0 To change pin 14 from an output pin to an input pin, the value of bit 4 in P1DDR must be changed from 1 to 0 (H'F0 to H'E0). Here the BCLR instruction will be used to clear bit 4 in P1DDR to 0. 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 0 0 0 0 0 Since RAM0 is a read/write area of memory, performing the above bit manipulation using the BCLR instruction causes only bit 4 in RAM0 to be cleared to 0. The value of RAM0 is then written 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 0 0 0 0 0 RAM0 1 1 1 0 0 0 0 0 By using the above procedure to access registers containing write-only bits, it is possible to create programs that are not dependent on the type of instructions used. |
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