M16C User Manual.pdf

External BusesMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTER5.2.2 Chip Selects and Address Bus______________Chip selects (P44/CS0 through P47/CS3) are output in areas resulting from dividing a 1-M bytememory space into four. To use the chip select, the chip select output must be enabled by setting thechip select control register. Figure 5.2.2 shows addresses in which chip selects become active (“L”).Since the extent of the internal area and the external area in memory expansion mode is different from_______those in microprocessor mode, there is a difference between areas for which CS0 is output. When aninternal ROM/RAM area is being accessed, no chip select is output, and the address bus does notchange (the address of the external area that was accessed previously is held).0000016003FF160040016XXXXX16SFR areaInternal RAM areaType No. Address XXXXX16 Address YYYYY16M30622M4 00FFF16 F800016M30620M8 02BFF16 F000016M30620MC/EC02BFF16E000016M30622M8/E8013FF16F000016M30622MA017FF16E800016M30622MC017FF16E000016M30624MG/FG053FF16C00001603FFF16Internal reserved area040001607FFF16CS30400016 to 07FFF16 (16K)CS30400016 to 07FFF16 (16K)080001627FFF16CS20800016 to 27FFF16 (128K)CS20800016 to 27FFF16 (128K)2800016CS12800016 to 2FFFF16 (32K)CS12800016 to 2FFFF16 (32K)2FFFF163000016CFFFF16D000016YYYYY16Internal reserved areaCS03000016 to CFFFF16 (640K)3000016 to F7FFF16 (800K)CS03000016 to FFFFF16 (832K)Internal ROM areaFFFFF16Memory expansion modeMicroprocessor modeNote 1: This memory maps show an instance in which PM13 is set to 0; but in the case of M30624MG/FG, they showan instance in which PM13 is set to 1.Note 2: This memory map show the address in normal mode.Figure 5.2.2. Addresses in which chip selects turn active (“L”)510