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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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ST75C540 数据表(PDF) 36 Page - STMicroelectronics |
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ST75C540 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 84 page  MR Memory Read MR Opcode: 10 000 10000 Synopsis MR allowsthe readingof a 16-bitparameter.The parameterspecifiesthe parameteraddress. Parameters Field Byte Pos. Value Definition MR_ADDR_L 1 7..0 Low byte of the 16-bit address MR_ADDR_H 2 7..0 High byte of the 16-bit address MRI Memory Read Indirect MRI Opcode: 28 001 01000 Synopsis MRI allows the reading of a 16-bit parameter. The parameter specifies an indirect address. Refer to the “RAM Mapping Application Note” (delivered on request according to revision number). The advantage to use MRI instead of MR is that the Indirect Address is constant over the different release of the product. Parameters Field Byte Pos. Value Definition MRI_IADDR 1 7..0 Indirect Address MRLO Memory Read Low Word MRLO Opcode: 29 001 01001 Synopsis MRLO allows the reading of the memory location which address coresponds to the previous MR or MRI Absolute Adress minus 1. This command must be preceded by a MR or MRI command. This command does not have any parameter. The double word reading is executed by the MR or MRI previous command. MW Memory Write MW Opcode: 12 000 10010 Synopsis MW allows the writing of a 16-bit parameter. The parameter specifies the address as well as the value to be transferred. Parameters Field Byte Pos. Value Definition MW_ADDR_L 1 7..0 Low byte of the 16-bit address MW_ADDR_H 2 7..0 High byte of the 16-bit address MW_VALUE_L 3 7..0 Low byte of the 16-bit value MW_VALUE_H 4 7..0 High byte of the 16-bit value VII - COMMAND SET DESCRIPTION (continued) ST75C530 - ST75C540 36/84 |
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