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CHAPTER 3 CPU ARCHITECTURE
3.1.1 Internal program memory space
The internal program memory space contains the program and table data. Normally, it is addressed with the
program counter (PC).
The
µ
PD780973 Subseries incorporate internal ROM (or flash memory), as listed below.
Table 3-1. Internal Memory Capacity
Part Number
Type
Capacity
µ
PD780973(A)
Mask ROM
24576
×
8 bits (0000H to 5FFFH)
µ
PD78F0974
Flash Memory
32768
×
8 bits (0000H to 7FFFH)
The following three areas are allocated to the program memory space.
(1) Vector table area
The 64-byte area 0000H to 003FH is reserved as a vector table area. This area stores program start addresses
to which execution branches when the RESET signal is input or when an interrupt request is generated. Of a
16-bit address, the lower 8 bits are stored at an even address and the higher 8 bits are stored at an odd address.
Table 3-2. Vector Table
Vector Table Address
Interrupt Source
0000H
RESET input
0004H
INTWDT
0006H
INTAD
0008H
INTOVF
000AH
INTTM00
000CH
INTTM01
000EH
INTTM02
0010H
INTP0
0012H
INTP1
0014H
INTP2
0016H
INTCS10
0018H
INTSER
001AH
INTSR
001CH
INTST
001EH
INTTM1
0020H
INTTM2
0022H
INTTM3
0024H
INTWE
0026H
INTWI
0028H
INTWT
003EH
BRK
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