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M306V7FGFP Datasheet(PDF) 9 Page - Renesas Technology Corp |
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M306V7FGFP Datasheet(HTML) 9 Page - Renesas Technology Corp |
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9 / 298 page  Rev.1.00 May 18, 2004 page 9 of 296 M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP 2. OPERATION OF FUNCTIONAL BLOCKS This microcomputer 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, OSD circuit, data slicer, A-D converter, and I/O ports. The following explains each unit. 2.1 Memory Figure 2.1.1 is a memory map. The address space extends the 1M bytes from address 0000016 to FFFFF16. From FFFFF16 down is ROM. For example, when M306V7MG-XXXFP is used, there is 256K bytes of internal ROM from C000016 to FFFFF16. The vector table for fixed interrupts such as the reset 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. 10K bytes of internal RAM is mapped to the space from 02C0016 to 053FF16. 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 2.1.2 to 2.1.5 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. The following spaces cannot be used. For example, area shown below cannot be used in M306V7 MG-XXXFP. • The space between 0140016 and 02BFF16 (in memory expansion and microprocessor modes) • The space between 0540016 and 07FFF16 (in memory expansion and microprocessor modes) • The space between 6000016 and BFFFF16 (in memory expansion mode) |
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