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HT66F40 数据表(PDF) 33 Page - Holtek Semiconductor Inc |
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HT66F40 数据表(HTML) 33 Page - Holtek Semiconductor Inc |
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33 / 244 page  HT68F20/HT68F30/HT68F40/HT68F50/HT68F60 HT68FU30/HT68FU40/HT68FU50/HT68FU60 Rev. 1.60 33 October 24, 2011 Bank Pointer - BP Depending upon which device is used, the Program and Data Memory are divided into several banks. Selecting the required Program and Data Memory area is achieved using the Bank Pointer. Bit 5 of the Bank Pointer is used to select Program Memory Bank 0 or 1, while bits 0~2 are used to select Data Memory Banks 0~4. The Data Memory is initialised to Bank 0 after a reset, except for a WDT time-out reset in the Power Down Mode, in which case, the Data Memory bank remains unaffected. It should be noted that the Special Function Data Memory is not affected by the bank selection, which means that the Special Function Registers can be accessed from within any bank. Directly addressing the Data Memory will always result in Bank 0 being ac- cessed irrespective of the value of the Bank Pointer. Ac- cessing data from banks other than Bank 0 must be implemented using Indirect addressing. As both the Program Memory and Data Memory share the same Bank Pointer Register, care must be taken during programming. Device Bit 76543210 HT68F20 HT68F40 ¾¾¾¾¾¾¾ DMBP0 HT68F30 HT68F50 ¾¾¾¾¾¾ DMBP1 DMBP0 HT68F60 ¾¾ PMBP0 ¾¾ DMBP2 DMBP1 DMBP0 BP Registers List · BP Register ¨ HT68F20/HT68F40 Bit 76543210 Name ¾¾¾¾¾¾¾ DMBP0 R/W ¾¾¾¾¾¾¾ R/W POR ¾¾¾¾¾¾¾ 0 Bit7~1 Unimplemented, read as ²0² Bit 0 DMBP0: Select Data Memory Banks 0: Bank 0 1: Bank 1 ¨ HT68F30/HT68F50 Bit 76543210 Name ¾¾¾¾¾¾ DMBP1 DMBP0 R/W ¾¾¾¾¾¾ R/W R/W POR ¾¾¾¾¾¾ 00 Bit7~2 Unimplemented, read as ²0² Bit1~0 DMBP1, DMBP0: Select Data Memory Banks 00: Bank 0 01: Bank 1 10: Bank 2 11: Undefined |
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