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4502_M Datasheet(PDF) 28 Page - Renesas Technology Corp |
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4502_M Datasheet(HTML) 28 Page - Renesas Technology Corp |
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28 / 214 page  1-16 Rev.2.01 Feb 02, 2005 4502 Group HARDWARE REJ09B0193-0201 PROGRAM MEMOY (ROM) The program memory is a mask ROM. 1 word of ROM is composed of 10 bits. ROM is separated every 128 words by the unit of page (addresses 0 to 127). Table 1 shows the ROM size and pages. Fig- ure 10 shows the ROM map of M34502M4. Table 1 ROM size and pages Part number M34502M2 M34502M4 M34502E4 ROM (PROM) size (✕ 10 bits) 2048 words 4096 words 4096 words Pages 16 (0 to 15) 32 (0 to 31) 32 (0 to 31) A part of page 1 (addresses 008016 to 00FF16) is reserved for in- terrupt addresses (Figure 11). When an interrupt occurs, the address (interrupt address) corresponding to each interrupt is set in the program counter, and the instruction at the interrupt address is executed. When using an interrupt service routine, write the in- struction generating the branch to that routine at an interrupt address. Page 2 (addresses 010016 to 017F16) is the special page for sub- routine calls. Subroutines written in this page can be called from any page with the 1-word instruction (BM). Subroutines extending from page 2 to another page can also be called with the BM in- struction when it starts on page 2. ROM pattern (bits 7 to 0) of all addresses can be used as data ar- eas with the TABP p instruction. Fig. 10 ROM map of M34502M4/M34502E4 Fig. 11 Page 1 (addresses 008016 to 00FF16) structure 0 876 543 21 000016 008016 017F16 Subroutine special page 007F16 00FF16 010016 018016 Page 1 Page 2 Page 0 Page 3 Page 31 0FFF16 Interrupt address page 9 90 8 765 432 1 External 0 interrupt address 008016 008216 Timer 1 interrupt address 008416 Timer 2 interrupt address 008616 008816 008A16 00FF16 A/D interrupt address 008C16 008E16 FUNCTION BLOCK OPERATIONS |
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