NEC 78K0 Series User Manual

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NEC 78K0 Series User Manual Manual pdf 56 page image

CHAPTER 3 CPU ARCHITECTUREPreliminary User’s Manual U17260EJ3V1UD563.1.1 Internal program memory spaceThe internal program memory space stores the program and table data. Normally, it is addressed with the programcounter (PC).78K0/KE2 products incorporate internal ROM (flash memory), as shown below.Table 3-2. Internal ROM CapacityInternal ROMPart NumberStructure CapacityμPD78F0531 16384 × 8 bits (0000H to 3FFFH)μPD78F0532 24576 × 8 bits (0000H to 5FFFH)μPD78F0533 32768 × 8 bits (0000H to 7FFFH)μPD78F0534 49152 × 8 bits (0000H to BFFFH)μPD78F0535 61440 × 8 bits (0000H to EFFFH)μPD78F0536 98304 × 8 bits(0000H to 7FFFH (common area) + 8000H to BFFFH (bank area) × 4)μPD78F0537,78F0537DFlash memory131072 × 8 bits(0000H to 7FFFH (common area) + 8000H to BFFFH (bank area) × 6)The internal program memory space is divided into the following areas.(1) Vector table areaThe 64-byte area 0000H to 003FH is reserved as a vector table area. The program start addresses for branchupon reset or generation of each interrupt request are stored in the vector table area.Of the 16-bit address, the lower 8 bits are stored at even addresses and the higher 8 bits are stored at oddaddresses.