Chapter 2 Address Spaces; Program Memory - Samsung S3F80JB User Manual

S3F80JB

PROGRAM MEMORY

Program memory (Flash memory) stores program code or table data. The S3F80JB has 64-Kbyte of internal
programmable Flash memory. The program memory address range is therefore 0000H–FFFFH of Flash memory
(See Figure 2-1).
The first 256 bytes of the program memory (0H–0FFH) are reserved for interrupt vector addresses. Unused
locations (0000H – 00FFH except 03CH, 03DH, 03EH and 03FH) in this address range can be used as normal
program memory. The location 03CH, 03DH, 03EH and 03FH is used as smart option ROM cell. If you use the
vector address area to store program code, be careful to avoid overwriting vector addresses stored in these
locations.
The program memory address at which program execution starts after reset is 0100H(default). If you use ISP
TM
sectors as the ISP software storage, the reset vector address can be changed by setting the Smart Option.
(Refer to Figure 2-2).
(Decimal)
65,536
Note 1
255
0
NOTES:
TM
1. The size of ISP sector can be varied by Smart Option. (Refer to Figure 2-2). According to the smart option setting
related to the ISP, ISP reset vector address can be changed one of addresses to be select (200H, 300H, 500H or
900H).
TM
2. ISP sector can store On Board Program Software (Refer to chapter 15. Embedded Flash Memory Interface).
2-2
384(256+128)byte
Internal RAM
Internal
Program
Memory
(Flash)
ISP Sector
Interrupt Vector Area
Smart Option Rom Cell
Figure 2-1. Program Memory Address Space
(HEX)
FFFFH
FE80H
S3F80JB(64Kbyte)
01FFH, 02FFH, 04FFH or 08FFH
0FFH
03FH
03CH
00H
ADDRESS SPACES
TM