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S3F80JB ADDRESS SPACES
2-2
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
TM
software storage, the reset vector address can be changed by setting the Smart Option.
(Refer to Figure 2-2).
Internal
Program
Memory
(Flash)
384(256+128)byte
Internal RAM
Interrupt Vector Area
ISP Sector
Smart Option Rom Cell
65,536
(Decimal)
255
000H
0FFH
FE80H
FFFFH
(HEX)
01FFH, 02FFH, 04FFH or 08FFH
03CH
03FH
S3F80JB(64Kbyte)
Note 1
Figure 2-1. Program Memory Address Space
NOTES:
1. The size of ISP
TM
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).
2. ISP
TM
sector can store On Board Program Software (Refer to chapter 15. Embedded Flash Memory Interface).