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C161 Datasheet(PDF) 167 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 167 Page - Infineon Technologies AG |
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167 / 400 page  &3, 7KH([WHUQDO%XV ,QWHUIDFH User’s Manual 9-3 1999-08 9.2 External Bus Modes When the external bus interface is enabled (bit BUSACTx=’1’) and configured (bitfield BTYP), the C161PI uses a subset of its port lines together with some control lines to build the external bus. The bus configuration (BTYP) for the address windows (BUSCON4...BUSCON1) is selected via software typically during the initialization of the system. The bus configuration (BTYP) for the default address range (BUSCON0) is selected via PORT0 during reset, provided that pin EA is low during reset. Otherwise BUSCON0 may be programmed via software just like the other BUSCON registers. The 16 MByte address space of the C161PI is divided into 256 segments of 64 KByte each. The 16-bit intra-segment address is output on PORT0 for multiplexed bus modes or on PORT1 for demultiplexed bus modes. When segmentation is disabled, only one 64 KByte segment can be used and accessed. Otherwise additional address lines may be output on Port 4 (addressing up to 8MByte) and/or several chip select lines may be used to select different memory banks or peripherals. These functions are selected during reset via bitfields SALSEL and CSSEL of register RP0H, respectively. Note: Bit SGTDIS of register SYSCON defines, if the CSP register is saved during interrupt entry (segmentation active) or not (segmentation disabled). Table 9-1 Summary of External Bus Modes BTYP Encoding External Data Bus Width External Address Bus Mode 0 0 8-bit Data Demultiplexed Addresses 0 1 8-bit Data Multiplexed Addresses 1 0 16-bit Data Demultiplexed Addresses 1 1 16-bit Data Multiplexed Addresses |
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