sm59264 SyncMOS Technologies,Inc, sm59264 Datasheet - Page 15

• Manufacturer Part Number: sm59264
• Description: 8-bits Micro-controller With 128kb Flash & 1kb Ram & Twsi & Spwm Embedded
• Manufacturer: SyncMOS Technologies,Inc

The lock bit N function is different from the flash protect function. The chip erase function can erase all of the flash
memory space including 64KB program flash & 64KB data flash, except for the locked ISP service program space. If
the flash not been protected, the content of flash program still can be read. If the flash been protected, the overall
content of flash program memory space including ISP service program space can not be read.
3.3 Program the ISP Service Program
After Lock Bit N is set and ISP service program been programmed, the ISP service program memory will be protected
(locked) automatically. The lock bit N has its own program/erase timing. It is different from the flash memory
program/erase timing so the locked ISP service program can not be erased by flash erase function. If user need to
erase the locked ISP service program, he can do it by writer only. User can not change ISP service program when
SM59264 was in system.
3.4 Initiate ISP Service Program
To initiate the ISP service program is to load the program counter (PC) with start address of ISP service program
and execute it. There are three ways to do so:
(1) Blank reset. Hardware reset with first flash address blank ($0000=#FFH) will load the PC with start address of ISP
(2) Execute ‘JUMP’ instruction can load the start address of the ISP service program to PC.
(3) Enter’s ISP service program by hardware setting. User can force SM59264 enter ISP service program by setting
Enters ISP service program by hardware setting:
User can initiate general 8052 UART function to initiate the ISP service program. After ISP service program executed,
user need to reset the SM59264, either by hardware reset or by WDT, or jump to the address $0000 to re-start the
firmware program.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M012 Ver B SM59264
on the lock bit N. Please see page 7 program memory diagram for this ISP service program space structure.
service program.
P2.6, P2.7 “low or P4.3 “low” during hardware reset period. In application system design, user should take care of
the setting of P2.6, P2.7 and P4.3 at reset period to prevent SM59264 from entering ISP service program.
SyncMOS Technologies International, Inc.
with 128KB flash & 1KB RAM & TWSI & SPWM embedded
15
8-Bits Micro-controller
SM59264
05/2009