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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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Z80 데이터시트(PDF) 22 Page - Zilog, Inc. |
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Z80 데이터시트(HTML) 22 Page - Zilog, Inc. |
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22 / 330 page  <%27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Counter/Timer Channels In Channel Control Register and Logic The Channel Control register (8-bit) and Logic is written to by the CPU to select the modes and parameters of the channel. Within the CTC device, four such registers correspond to the four Counter/Timer channels. The register to be written to is determined by the encoding of two channel select input pins: CS0 and CS1, which are usually attached to A0 and A1 of the CPU address bus. The channel values are described in Table 1. In the control word, which is written to program each Channel Control register, bit 0 is always set; the other seven bits are programmed to select alternatives on the channel’s operating modes and parameters. These values are described in Table 2. For a more complete discussion, see “CTC Operating Modes” on page 16 and “CTC Programming” on page 18). Figure 2. Channel Block Diagram Table 1. Channel Values CS0 CS1 Channel 0 0 0 Channel 1 0 1 Channel 2 1 0 Channel 3 1 1 ZC/TO Prescaler CLK CLK/TRG Internal Bus 8-Bit Down Counter Time Constant Register Channel Control Logic |
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