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M16623MC Datasheet(PDF) 11 Page - Renesas Technology Corp |
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M16623MC Datasheet(HTML) 11 Page - Renesas Technology Corp |
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11 / 242 page  Memory Mitsubishi microcomputers M16C / 62A Group (80-pin) SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER 10 Operation of Functional Blocks The M16C/62A (80-pin version) 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, D-A converter, DMAC, CRC calculation circuit, A-D converter, and I/O ports. The following explains each unit. Memory Figure 1.4.1 is a memory map of the M16C/62A (80-pin version) group. The address space extends the 1M bytes from address 0000016 to FFFFF16. From FFFFF16 down is ROM. For example, in the M30623MCA- 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 M30623MCA-XXXGP, 5K bytes of internal RAM is mapped to the space from 0040016 to 017FF16. 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 1.7.1 to 1.7.3 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. Figure 1.4.1. Memory map 0000016 YYYYY16 FFFFF16 0040016 XXXXX16 Internal ROM area SFR area For details, see Figures 1.7.1 to 1.7.3 Internal RAM area Reserved area FFE0016 FFFDC16 FFFFF16 Note : These memory maps show an instance in which PM13 is set to 0; but in the case of products in which the internal RAM and the internal ROM are expanded to over 15 Kbytes and 192 Kbytes, respectively, they show an instance in which PM13 is set to 1. Undefined instruction Overflow BRK instruction Address match Single step Watchdog timer Reset Special page vector table DBC NMI Address YYYYY16 3K bytes 00FFF16 053FF16 017FF16 013FF16 Address XXXXX16 ROM size 02BFF16 5K bytes 4K bytes 10K bytes 20K bytes RAM size 32K bytes C000016 E800016 F000016 E000016 96K bytes 64K bytes 128K bytes 256K bytes F800016 |
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