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682 / 940 page  CONNECTING EXTERNAL DEVICES 7735 Group User’s Manual 12–6 ____ ____ 12.1.1 External bus (A0/D0 to A15/D15, A16 and A17) and chip select signals (CS0 to CS4) The address (A0 to A17) and chip select signals are output and specify the external area. Figures 12.1.2 and 12.1.3 show the external areas specified by these signals. An area specified by a chip select signal does not the internal area. (When the internal area is accessed, the chip select signal is not output.) Pins A8 to A15 of the external address bus and pins D0 to D15 of the external data bus share the same pins. When pin BYTE’s level, which is described later, is “L” (in other words, when the external data bus is 16 bits wide), pins A0/D0 to A15/D15 perform address output and data input/output with the time-sharing method. When pin BYTE’s level is “H” (in other words, when the external data bus is 8 bits wide), pins A0/ D0 to A7/D7 perform address output and data input/output with the time-sharing method and pins A8 to A15 output the address. Fig. 12.1.2 External area (Memory expansion mode) 12.1 Signals required for accessing external devices : External area specified by address and chip select signal 00000016 00100016 Memory expansion mode (for M37735MHBXXXFP) 02000016 0FFFFF16 04000016 08000016 0C000016 CS1 CS2 CS3 CS4 00008016 Memory allocation selection bits (b2,b1,b0) = 00000016 00100016 02000016 0FFFFF16 04000016 08000016 0C000016 CS1 CS2 CS3 CS4 00008016 00200016 CS0 (0,0,1) 00000016 00100016 02000016 0FFFFF16 04000016 08000016 0C000016 CS1 CS2 CS3 CS4 00008016 00800016 CS0 (1,1,0) 00000016 00100016 0FFFFF16 04000016 08000016 0C000016 CS1 CS2 CS3 CS4 00008016 00800016 CS0 (1,1,1) (0,0,0) g The memory allocation selection bits must be set as above. 01000016 Internal RAM area SFR area Internal ROM area Internal RAM area SFR area Internal ROM area Internal RAM area SFR area Internal ROM area Internal RAM area SFR area Internal ROM area |
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