UPD78F9234MC-5A4-A Datasheet, PDF (32/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 3 CPU ARCHITECTURE
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/KB1+ provides the following internal ROMs (or flash memory) containing the following capacities.
Table 3-1. Internal ROM Capacity
Part Number
μPD78F9232
μPD78F9234
Structure
Flash memory
Internal ROM
Capacity
4,096 × 8 bits
8,192 × 8 bits
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 input or interrupt request generation. Of a
16-bit address, the lower 8 bits are stored in an even address, and the higher 8 bits are stored in an odd
address.
Table 3-2. Vector Table
Vector Table Address
Interrupt Request
Vector Table Address
0000H
Reset input
0012H
0006H
INTLVI
0016H
0008H
INTP0
0018H
000AH
INP1
001AH
000CH
INTTMH1
001CH
000EH
INTTM000
001EH
0010H
INTTM010
0020H
Caution No interrupt sources correspond to the vector table address 0014H.
Interrupt Request
INTAD
INTP2
INTP3
INTTM80
INTSRE6
INTSR6
INTST6
(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 18 OPTION
BYTE.
(4) Protect byte area
The protect byte area is the 1-byte area of address 0081H. For details, refer to CHAPTER 19 FLASH
MEMORY.
3.1.2 Internal data memory space
μPD78F9232 and μPD78F9234 provide 256-byte internal high-speed RAM.
The internal high-speed RAM can also be used as a stack memory.
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User’s Manual U17446EJ5V0UD