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M30302M8-XXXGP Datasheet(PDF) 11 Page - Renesas Technology Corp |
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M30302M8-XXXGP Datasheet(HTML) 11 Page - Renesas Technology Corp |
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11 / 178 page  Mitsubishi microcomputers M16C / 30 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Memory 10 Operation of Functional Blocks The M16C/30 group accommodates certain units in a single chip. These units include ROM and RAM to store instructions and data and the central processing unit (CPU) to execute arithmetic/logic operations. Also included are peripheral units such as timers, serial I/O, DMAC, A-D converter, and I/O ports. The following explains each unit. Memory Figure 1.3.1 is a memory map of the M16C/30 group. The address space extends the 1M bytes from address 0000016 to FFFFF16. From FFFFF16 down is ROM. For example, in the M30302MC-XXXGP, there is 128K bytes of internal ROM from E000016 to FFFFF16. The vector table for fixed interrupts such as _______ the reset and NMI are mapped to FFFDC16 to FFFFF16. The starting address of the interrupt routine is stored here. The address of the vector table for timer interrupts, etc., can be set as desired using the internal register (INTB). See the section on interrupts for details. From 0040016 up is RAM. For example, in the M30302MC-XXXGP, 3K bytes of internal RAM is mapped to the space from 0040016 to 00FFF16. In addition to storing data, the RAM also stores the stack used when calling subroutines and when interrupts are generated. The SFR area is mapped to 0000016 to 003FF16. This area accommodates the control registers for periph- eral devices such as I/O ports, A-D converter, serial I/O, and timers, etc. Figures 1.6.1 to 1.6.3 are location of peripheral unit control registers. Any part of the SFR area that is not occupied is reserved and cannot be used for other purposes. The special page vector table is mapped to FFE0016 to FFFDB16. If the starting addresses of subroutines or the destination addresses of jumps are stored here, subroutine call instructions and jump instructions can be used as 2-byte instructions, reducing the number of program steps. In memory expansion mode and microprocessor mode, a part of the spaces are reserved and cannot be used. For example, in the M30302MC-XXXGP, the following spaces cannot be used. • The space between 0180016 and 03FFF16 (Memory expansion and microprocessor modes) • The space between D000016 and DFFFF16 (Memory expansion mode) Figure 1.3.1. Memory map 0000016 YYYYY16 FFFFF16 0040016 0400016 XXXXX16 D000016 External area Internal ROM area SFR area For details, see Figures 1.6.1 to 1.6.3 Internal RAM area Internal reserved area (Note 1) Internal reserved area (Note 2) FFE0016 FFFDC16 FFFFF16 Note 1: During memory expansion and microprocessor modes, can not be used. Note 2: In memory expansion mode, can not be used. Undefined instruction Overflow BRK instruction Address match Single step Watchdog timer Reset Special page vector table DBC NMI Address YYYYY16 ROM size 32K bytes E800016 F000016 E000016 96K bytes 64K bytes 128K bytes F800016 2K bytes 00BFF16 Address XXXXX16 RAM size 3K bytes 00FFF16 |
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