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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) 111 Page - Renesas Technology Corp |
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H8S2245 датащи(HTML) 111 Page - Renesas Technology Corp |
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111 / 818 page  Section 2 CPU Rev.3.00 Mar. 26, 2007 Page 69 of 772 REJ09B0355-0300 Write data to the work area Write the work area data to the register that includes write-only bits Access the work area data (data transfer and bit manipulation instructions can be used) Write the work area data to the register that includes write-only bits Initial value write Modifying the value of a register that includes write-only bits Figure 2.21 Flowchart for Access Methods for Registers That Include Write-Only Bits Example: To clear only bit 4 in the port 1 P1DDR The P1DDR register consists of 8 write-only bits and sets the I/O direction of the port 1 pins. Reading this register is invalid. When read, the values returned are undefined. Here we present an example in which P14 is specified to be an input port using the BCLR instruction. First, we write the initial value H'F0 written to P1DDR to the work area in RAM (RAM0). MOV.B #H'F0, R0L MOV.B R0L, @PAM0 MOV.B R0L, @P1DDR 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 11 1 1 00 0 0 |
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