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S3F80JB EMBEDDED FLASH MEMORY INTERFACE
15-3
ISP
TM
(ON-BOARD PROGRAMMING) SECTOR
ISP
TM
sectors located in program memory area can store On Board Program Software (Boot program code for
upgrading application code by interfacing with I/O port pin). The ISP
TM
sectors can’t be erased or programmed by
‘LDC’ instruction for the safety of On Board Program Software.
The ISP sectors are available only when the ISP enable/disable bit is set 0, that is, enable ISP at the Smart
Option. If you don’t like to use ISP sector, this area can be used as a normal program memory (can be erased or
programmed by ‘LDC’ instruction) by setting ISP disable bit (“1”) at the Smart Option. Even if ISP sector is
selected, ISP sector can be erased or programmed in the tool program mode by serial programming tools.
The size of ISP sector can be varied by settings of smart option (Refer to Figure 2-2 and Table 15-2). You can
choose appropriate ISP sector size according to the size of On Board Program Software.
Internal
Program
Memory
(Flash)
384(256+128)byte
Internal RAM
Interrupt Vector Area
ISP Sector
Smart Option ROM Cell
65,536
(Decimal)
255
0 00H
0FFH
FE80H
FFFFH
(HEX)
01FFH, 02FFH, 04FFH or 08FFH
03CH
03FH
Figure 15-1. Program Memory Address Space