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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) 89 Page - Holtek Semiconductor Inc |
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HT66F40 数据表(HTML) 89 Page - Holtek Semiconductor Inc |
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89 / 244 page  HT68F20/HT68F30/HT68F40/HT68F50/HT68F60 HT68FU30/HT68FU40/HT68FU50/HT68FU60 Rev. 1.60 89 October 24, 2011 ¨ HT68F50/HT68F60 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. As the CCRA and CCRB registers are implemented in the way shown in the following diagram and accessing these register pairs is carried out in a specific way described above, it is recommended to use the ¡§MOV¡¨ instruction to ac- cess the CCRA and CCRB low byte registers, named TMxAL and TMxBL, using the following access procedures. Ac- cessing the CCRA or CCRB low byte registers without following these access procedures will result in unpredictable values. 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. 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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