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UPD70F3114 Datasheet(PDF) 59 Page - NEC |
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UPD70F3114 Datasheet(HTML) 59 Page - NEC |
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59 / 692 page  CHAPTER 3 CPU FUNCTION 59 User’s Manual U15195EJ5V0UD 3.4.3 Wrap-around of CPU address space (1) Program space Of the 32 bits of the PC (program counter), the higher 6 bits are fixed to 0, and only the lower 26 bits are valid. Even if a carry or borrow occurs from bit 25 to 26 as a result of branch address calculation, the higher 6 bits ignore the carry or borrow. Therefore, the upper-limit address of the program space, address 03FFFFFFH, and the lower-limit address 00000000H become contiguous addresses. Wrap-around refers to a situation like this whereby the lower- limit address and upper-limit address become contiguous. Caution The 4 KB area of 03FFF000H to 03FFFFFFH can be seen as an image of 0FFFF000H to 0FFFFFFFH. No instruction can be fetched from this area because this area is defined as on-chip peripheral I/O area. Therefore, do not execute any branch address calculation in which the result will reside in any part of this area. 03FFFFFEH 03FFFFFFH 00000000H 00000001H Program space Program space (+) direction ( ) direction (2) Data space The result of an operand address calculation that exceeds 32 bits is ignored. Therefore, the upper-limit address of the program space, address FFFFFFFFH, and the lower-limit address 00000000H are contiguous addresses, and the data space is wrapped around at the boundary of these addresses. FFFFFFFEH FFFFFFFFH 00000000H 00000001H Data space Data space (+) direction ( ) direction |
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