Internal Program Memory Space - NEC 78K0 User Manual

8-bit single-chip microcontrollers

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Internal program memory space

The internal program memory space stores the program and table data. Normally, it is addressed with the program

counter (PC).

78K0/KF1 products incorporate internal ROM (mask ROM or flash memory), as shown below.

The internal program memory space is divided into the following areas.

(1) Vector table area

The 64-byte area 0000H to 003FH is reserved as a vector table area. The program start addresses for branch

upon reset signal input 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 odd

Vector Table Address

Note Available only in the

CHAPTER 3 CPU ARCHITECTURE

Table 3-2. Internal ROM Capacity

Flash memory

Table 3-3. Vector Table

Interrupt Source

RESET input, POC, LVI,

clock monitor, WDT

INTCSI10/INTST0

PD780146, 780148, and 78F0148.

User's Manual U15947EJ2V0UD

Internal ROM

24576 × 8 bits (0000H to 5FFFH)

32768 × 8 bits (0000H to 7FFFH)

49152 × 8 bits (0000H to BFFFH)

61440 × 8 bits (0000H to EFFFH)

Vector Table Address

Interrupt Source

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