MPC89L54A Megawin Technology, MPC89L54A Datasheet - Page 30

• Manufacturer Part Number: MPC89L54A
• Description: 8-bit micro-controller
• Manufacturer: Megawin Technology

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Booting Program Entrance
The MPC89x54A boots according to the following rule.
Above rule is adaptive only for power-up procedure, while not software reset.
Switching from ISP program to AP program
The device permits the user normally start running the AP program as soon as the ISP program
has finished updating the flash content. Just program an instruction at the tail of ISP program as
30
IFMT ← xxxxx001
ISPCR ← 100xx010
IFADRH ← (Address high byte)
IFADRL ← (Address low byte)
SCMD ← 46h
SCMD ← B9h
(CPU progressing will be hold here)
(CPU continues and currently IFD contain the desired data byte )
If ( HWBS == 0 )
else
IFMT ← xxxxx010
ISPCR ← 100xx010
IFADRH ← (Address high byte)
IFADRL ← (Address low byte)
IFD ← (byte date to be written into flash)
SCMD ← 46h
SCMD ← B9h
(CPU progressing will be hold here)
(CPU continues)
ISPCR ←
System will boot from ISP program
System will boot from normal AP program
001xxxxx
b
b
&&
b
b
b
MPC89x54A Data Sheet
( { ISPAS1, ISPAS0}
Program a byte into flash
Read a byte from flash
/* set ISPEN=1 to enable flash change.
/* set ISPEN=1 to enable flash change.
/* specify the address to be read */
/* specify the address to be programmed */
/* prepare data source */
/* choice byte-read command */
set WAIT=010, 11 MC; assumed 10M X’s*/
/* choice byte-programming command */
set WAIT=010, 60 MC; assumed 10M X’s*/
/* trig ISP activity */
/* trig ISP activity */
≠
{ 1, 1 })
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