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MC81F4204B Datasheet(PDF) 46 Page - Finechips |
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MC81F4204B Datasheet(HTML) 46 Page - Finechips |
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46 / 150 page  MC81F4204 46 October 19, 2009 Ver.1.35 9.2 Program Memory A 16-bit program counter is capable of addressing up to 64K bytes, but this device has 4K bytes program memory space only physically implemented. Accessing a location above FFFFH will cause a wrap-around to 0000H. Figure 9-6 shows a map of Program Memory. After reset, the CPU begins execution from reset vector which is stored in address FFFEH and FFFFH. As shown in Figure 9-6, each area is assigned a fixed location in Program Memory. Program memory area contains the user program Page Call (PCALL) area contains subroutine program to reduce program byte length by using 2 bytes PCALL instead of 3 bytes CALL instruction. If it is frequently called, it is more useful to save program byte length. Table Call (TCALL) causes the CPU to jump to each TCALL address, where it commences the execution of the service routine. The Table Call service area spaces 2-byte for every TCALL: 0FFC0H for TCALL15, 0FFC2H for TCALL14, etc., as shown in Figure 9-7. The interrupt causes the CPU to jump to specific location where it commences the execution of the service routine. The interrupt service locations spaces 2-byte interval. The External interrupt 1, for Example, is assigned to location 0FFFCH. Any area from 0FF00H to 0FFFFH, if it is not going to be used, its service location is available as general purpose Program Memory. TCALL Area Interrupt Vector Area 0FFFFH 0FFDFH 0FFE0H 0FFC0H 0FF00H 0FEFFH 0F000H Figure 9-6 Program Memory Map |
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