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C161 Datasheet(PDF) 165 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 165 Page - Infineon Technologies AG |
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165 / 400 page  &3, 7KH([WHUQDO%XV ,QWHUIDFH User’s Manual 9-1 1999-08 9 The External Bus Interface Although the C161PI provides a powerful set of on-chip peripherals and on-chip RAM and ROM/OTP/Flash (except for ROMless versions) areas, these internal units only cover a small fraction of its address space of up to 16 MByte. The external bus interface allows to access external peripherals and additional volatile and non-volatile memory. The external bus interface provides a number of configurations, so it can be taylored to fit perfectly into a given application system. Figure 9-1 SFRs and Port Pins Associated with the External Bus Interface Accesses to external memory or peripherals are executed by the integrated External Bus Controller (EBC). The function of the EBC is controlled via the SYSCON register and the BUSCONx and ADDRSELx registers. The BUSCONx registers specify the external bus cycles in terms of data width (16-bit/8-bit), chip selects and length (waitstates / ALE / RW delay). These parameters are used for accesses within a specific address area which is defined via the corresponding register ADDRSELx. The four pairs BUSCON1/ADDRSEL1...BUSCON4/ADDRSEL4 allow to define four independent “address windows”, while all external accesses outside these windows are controlled via register BUSCON0. P4 BUSCON0 BUSCON1 BUSCON2 ADDRSEL4 P0L / P0H ADDRSEL1 SYSCON ADDRSELxAddress Range Select Register 1...4 BUSCONx Bus Mode Control Register 0...4 SYSCON System Control Register RP0H Port P0H Reset Configuration Register Ports & Direction Control Alternate Functions Address Registers Mode Registers Control Registers BUSCON3 BUSCON4 ADDRSEL2 RP0H DP3 P3 ADDRSEL3 P1L / P1H P6 ODP6E DP6 PORT0 EA PORT1 RSTIN ALE READY RD WR/WRL BHE/WRH P0L/P0H PORT0 Data Registers P1L/P1H PORT1 Data Registers DP3 Port 3 Direction Control Register P3 Port 3 Data Register P4 Port 4 Data Register ODP6 Port 6 Open Drain Control Register DP6 Port 6 Direction Control Register P6 Port 6 Data Register |
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