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3.1.1 Internal program memory space
The internal program memory space stores programs and table data. Normally, this space is addressed using
the program counter (PC).
Each product in the µ PD780208 Subseries contains internal ROM (or PROM) with the capacity shown below.
The following areas are allocated to the internal program memory space.
(1) Vector table area
The 64-byte area 0000H to 003FH is reserved as vector table area. Program start addresses for branch upon
RESET input or interrupt request generation 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
0000H
0004H
0006H
0008H
000AH
000CH
000EH
(2) CALLT instruction table area
The 64-byte area 0040H to 007FH can store the subroutine entry address of a 1-byte call instruction (CALLT).
(3) CALLF instruction entry area
The area 0800H to 0FFFH can perform a direct subroutine call with a 2-byte call instruction (CALLF).
CHAPTER 3 CPU ARCHITECTURE
Table 3-1. Internal ROM Capacity
Part Number
Configuration
µ PD780204
Mask ROM
µ PD780204A
µ PD780205
Mask ROM
µ PD780205A
µ PD780206
Mask ROM
µ PD780208
Mask ROM
µ PD78P0208
PROM
Table 3-2. Vector Table
Interrupt Source
RESET input
INTWDT
INTP0
INTP1
INTP2
INTP3
INTCSI0
User's Manual U11302EJ4V0UM
Internal ROM
Capacity
32768 x 8 bits
40960 x 8 bits
49152 x 8 bits
61440 x 8 bits
61440 x 8 bits
Vector Table Address
0010H
0012H
0014H
0016H
0018H
001AH
001CH
003EH
Interrupt Source
INTCSI1
INTTM3
INTTM0
INTTM1
INTTM2
INTAD
INTKS
BRK instruction
53
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