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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U15104EJ2V0UD
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.
Table 3-1. Internal Memory Capacities
Part Number
Structure
Capacity
µ
PD178053
Mask ROM
24576
×
8 bits (0000F to 5FFFH)
µ
PD178054
32768
×
8 bits (0000H to 7FFFH)
µ
PD178F054
Flash memory
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.
Table 3-2. Vector Table
Vector Table Address
Interrupt Request
0004H
INTWDT
0006H
INTP0
0008H
INTP1
000AH
INTP2
000CH
INTP3
000EH
INTP4
0010H
INTKY
0012H
INTCSI31
0014H
INTBTM0
0016H
INTAD3
0018H
INTCSI32
001AH
INTCSI30
001CH
INTTM50
001EH
INTTM51
0020H
INTTM52
0022H
INTTM53
003EH
BRK
Содержание mPD178053
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