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ADDRESS SPACES
PROGRAM MEMORY (ROM)
Program memory (ROM) stores program codes or table data. The S3C8248 has 8K bytes internal mask-
programmable program memory, the S3C8245 has 16K bytes, the S3C8247 has 24K bytes and the S3C8249 has
32K bytes.
The first 256 bytes of the ROM (0H–0FFH) are reserved for interrupt vector addresses. Unused locations in this
address range can be used as normal program memory. If you use the vector address area to store a program
code, be careful not to overwrite the vector addresses stored in these locations.
The ROM address at which a program execution starts after a reset is 0100H.
2-2
(Decimal)
32K-byte
32,767
24K-byte
16384
16383
16K-byte
8K-byte
255
Interrupt
Vector Area
0
Figure 2-1. Program Memory Address Space
S3C8248/C8245/P8245/C8247/C8249/P8249
(HEX)
7FFFH (S3C8249)
6000H
5FFFH (S3C8247)
4000H
3FFFH (S3C8245)
2000H
1FFFH (S3C8248)
0FFH
0H
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