Internal Program Memory Space - NEC mPD178054 Series User Manual

3.1.1 Internal program memory space

Programs and table data are stored in internal program memory space, and are usually addressed by the program
counter (PC).
The µ PD178054 Subseries has internal ROM (or flash memory) as shown in the following table.
Part Number
µ PD178053
µ PD178054
µ PD178F054
The following areas are assigned to the internal program memory space.
(1) Vector table area
The 64-byte area 0000H to 003FH is reserved as a vector table area. The reset input and program start
addresses for branch upon 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 addresses.
Vector Table Address
0004H
0006H
0008H
000AH
000CH
000EH
0010H
0012H
0014H
0016H
0018H
001AH
001CH
001EH
0020H
0022H
003EH
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CHAPTER 3 CPU ARCHITECTURE
Table 3-1. Internal Memory Capacities
Structure
Mask ROM
Flash memory
Table 3-2. Vector Table
INTWDT
INTP0
INTP1
INTP2
INTP3
INTP4
INTKY
INTCSI31
INTBTM0
INTAD3
INTCSI32
INTCSI30
INTTM50
INTTM51
INTTM52
INTTM53
BRK
User's Manual U15104EJ2V0UD
Capacity
24576 × 8 bits (0000F to 5FFFH)
32768 × 8 bits (0000H to 7FFFH)
Interrupt Request