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7641 Datasheet(PDF) 253 Page - Renesas Technology Corp |
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7641 Datasheet(HTML) 253 Page - Renesas Technology Corp |
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253 / 385 page  Rev.2.00 Aug 28, 2006 page 122 of 148 7641 Group REJ09B0336-0200 APPLICATION 2.10 External devices connection 2.10.3 Functional description This MCU starts its operation in the single-chip mode just after reset. (1) Memory expansion mode This mode is selected by setting “01” to the processor mode bits (b1, b0 of CPMA) in software with CNVSS connected to VSS. In this mode, the ports function as follows: Ports P0 and P1 as address buses (AB0 to AB15) Port P2 as data buses (DB0 to DB7) ______ ______ Ports P33 to P37 as DMAOUT, φOUT, SYNCOUT, WR, RD pins respectively. This mode enables external memory expansion while maintaining the validity of the internal ROM. (2) Microprocessor mode This mode is selected by resetting the MCU with CNVSS connected to VCC, or by setting “10” to the processor mode bits (b1, b0 of CPMA) in software with CNVSS connected to VSS. The function is the same as that of memory expansion mode. In the microprocessor mode, the internal ROM is no longer valid and an external memory must be used. Do not set this mode in the flash memory version. |
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