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ST10F166BQ1 Datasheet(PDF) 9 Page - STMicroelectronics |
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ST10F166BQ1 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 62 page ST10F166 9/62 3 EXTERNAL BUS CONTROLLER All external memory accesses are performed by the on-chip External Bus Controller (EBC). During Reset, it can be programmed to either the Single Chip Mode when no external memory is required, or to one of four different external memory access modes, which are as follow: 16/18 bit Addresses, 8 bit Data, Demultiplexed 16/18 bit Addresses, 8 bit Data, Multiplexed 16/18 bit Addresses, 16 bit Data, Demultiplexed 16/18 bit Addresses, 16 bit Data, Multiplexed In the demultiplexed bus mode, Port 1 is used as an output for addresses and Port 0 is used as an input/output for data. In the multiplexed bus modes, one of the two 16 bit ports, Port 0, is used as an input/output for both addresses and data. For applications which require less than 64 Kbytes of memory space, a non-segment- ed memory model can be selected. During the initialization phase, the bus configura- tion and mapping of the Flash Memory to segment 1 may be programmed. After the EINIT instruction, only the external bus configuration can be changed at any time. In this case,all memory locations can be addressed by 16 bits, and thus port 4 is not needed as an output for the two significant address biss (A17 and A16, as is the case when using the segmented memory model. |
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