Internal Program Memory Space; Internal Data Memory Space - NEC 78K0S/KA1+ User Manual

3.1.1 Internal program memory space

The internal program memory space stores programs and table data. This space is usually addressed by the
program counter (PC).
The 78K0S/KA1+ provides the following internal ROMs (or flash memory) containing the following capacities.
Part Number
µ
PD78F9221
µ
PD78F9222
The following areas are allocated to the internal program memory space.
(1) Vector table area
The 34-byte area of addresses 0000H to 0021H is reserved as a vector table area. This area stores program
start addresses to be used when branching by Reset or interrupt request generation.
16-bit address, the lower 8 bits are stored in an even address, and the higher 8 bits are stored in an odd
address.
Vector Table Address
0000H
0006H
0008H
000AH
000CH
000EH
0010H
Caution No interrupt sources correspond to the vector table address 0014H.
(2) CALLT instruction table area
The subroutine entry address of a 1-byte call instruction (CALLT) can be stored in the 64-byte area of
addresses 0040H to 007FH.
(3) Option byte area
The option byte area is the 1-byte area of address 0080H. For details, refer to CHAPTER 17 OPTION BYTE.
(4) Protect byte area
The protect byte area is the 1-byte area of address 0081H. For details, refer to CHAPTER 18 FLASH
MEMORY.

3.1.2 Internal data memory space

128-byte internal high-speed RAM is provided in the
The internal high-speed RAM can also be used as a stack memory.
CHAPTER 3 CPU ARCHITECTURE
Table 3-1. Internal ROM Capacity
Structure
Flash memory
Table 3-2. Vector Table
Interrupt Request
Reset
INTLVI
INTP0
INP1
INTTMH1
INTTM000
INTTM010
µ
PD78F9221 and 256-byte in the
User's Manual U16898EJ3V0UD
Internal ROM
Capacity
2,048 × 8 bits
4,096 × 8 bits
Vector Table Address
0012H
0016H
0018H
001AH
001CH
001EH
0020H
Of a
Interrupt Request
INTAD
INTP2
INTP3
INTTM80
INTSRE6
INTSR6
INTST6
µ
PD78F9222.
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