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H8SX/1663R Datenblatt(PDF) 264 Page - Renesas Technology Corp |
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H8SX/1663R Datenblatt(HTML) 264 Page - Renesas Technology Corp |
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264 / 1504 page ![]() Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 232 of 1468 REJ09B0412-0200 Interface Description Area Name DRAM interface Directly connected to DRAM DRAM space Synchronous DRAM interface Directly connected to synchronous DRAM Synchronous DRAM space Table 9.5 Areas Specifiable for Each Interface Areas Interface Related Registers 0 1 2 3 4 5 6 7 Basic interface O O O O O O O O Byte control SRAM interface SRAMCR O O O O O O O O Burst ROM interface BROMCR O O Address/data multiplexed I/O interface MPXCR O O O O O DRAM interface O Synchronous DRAM interface DRAMCR O (2) Bus Width A bus width of 8 or 16 bits can be selected with ABWCR. An area for which an 8-bit bus is selected functions as an 8-bit access space and an area for which a 16-bit bus is selected functions as a 16-bit access space. In addition, the bus width of address/data multiplexed I/O space is 8 bits or 16 bits, and the bus width for the byte control SRAM space is 16 bits. The initial state of the bus width is specified by the operating mode. If all areas are designated as 8-bit access space, 8-bit bus mode is set; if any area is designated as 16-bit access space, 16-bit bus mode is set. (3) Endian Format Though the endian format of this LSI is big endian, data can be converted into little endian format when reading or writing to the external address space. Areas 7 to 2 can be specified as either big endian or little endian format by the LE7 to LE2 bits in ENDIANCR. The initial state of each area is the big endian format. Note that the data format for the areas used as a program area or a stack area should be big endian. |
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