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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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HT66F40 数据表(PDF) 86 Page - Holtek Semiconductor Inc |
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HT66F40 数据表(HTML) 86 Page - Holtek Semiconductor Inc |
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86 / 246 page  HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Rev. 1.10 86 February 1, 2010 ¨ HT66F50/HT66F60 Bit 76543210 Name ¾¾ T3CP1 T3CP0 ¾¾ T2CP1 T2CP0 R/W ¾¾ R/W R/W ¾¾ R/W R/W POR ¾¾ 01 ¾¾ 01 Bit 7~6 Unimplemented, read as ²0² Bit 5 T3CP1: TP3_1 pin Control 0: disable 1: enable Bit 4 T3CP0: TP3_0 pin Control 0: disable 1: enable Bit 3~2 Unimplemented, read as ²0² Bit 1 T2CP1: TP2_1 pin Control 0: disable 1: enable Bit 0 T2CP0: TP2_0 pin Control 0: disable 1: enable Programming Considerations The TM Counter Registers and the Capture/Compare CCRA and CCRB registers, being either 10-bit or 16-bit, all have a low and high byte structure. The high bytes can be directly accessed, but as the low bytes can only be accessed via an internal 8-bit buffer, reading or writing to these register pairs must be carried out in a specific way. The important point to note is that data transfer to and from the 8-bit buffer and its related low byte only takes place when a write or read operation to its corresponding high byte is executed. The following steps show the read and write procedures: · Writing Data to CCRB or CCRA ¨ Step 1. Write data to Low Byte TMxAL or TMxBL - note that here data is only written to the 8-bit buffer. ¨ Step 2. Write data to High Byte TMxAH or TMxBH - here data is written directly to the high byte registers and simultaneously data is latched from the 8-bit buffer to the Low Byte registers. · Reading Data from the Counter Registers and CCRB or CCRA ¨ Step 1. Read data from the High Byte TMxDH, TMxAH or TMxBH - here data is read directly from the High Byte registers and simultaneously data is latched from the Low Byte register into the 8-bit buffer. ¨ Step 2. Read data from the Low Byte TMxDL, TMxAL or TMxBL - this step reads data from the 8-bit buffer. Data Bus 8-bit Buffer TMxDH TMxDL TMxBH TMxBL TMxAH TMxAL TM Counter Register (Read only) TM CCRA Register (Read/Write) TM CCRB Register (Read/Write) |
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