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M30622SAFP Datasheet(PDF) 10 Page - Mitsubishi Electric Semiconductor |
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M30622SAFP Datasheet(HTML) 10 Page - Mitsubishi Electric Semiconductor |
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10 / 274 page  Mitsubishi microcomputers M16C / 62A Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Memory 10 Operation of Functional Blocks The M16C/62A 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 1.3.1 is a memory map of the M16C/62A group. The address space extends the 1M bytes from address 0000016 to FFFFF16. From FFFFF16 down is ROM. For example, in the M30622MCA-XXXFP, 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 M30622MCA-XXXFP, 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 1.6.1 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 M30622MCA-XXXFP, the following spaces cannot be used. • The space between 0180016 and 03FFF16 (Memory expansion and microprocessor modes) • The space between D000016 and D7FFF16 (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. Note 3: These memory maps show an instance in which PM13 is set to 0; but in the case of M30624MGA/FGA, 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 M30622M4A 00FFF16 F800016 C000016 053FF16 M30624MGA/FGA M30620M8A 02BFF16 F000016 E800016 017FF16 M30622MAA E000016 017FF16 M30622MCA M30620MAA E800016 02BFF16 M30622M8A F000016 013FF16 Address XXXXX16 Type No. Address YYYYY16 M30620MCA/FCA E000016 02BFF16 |
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