which disables flash-writing authority, set SWBS 0, and trigger a software reset. After that, the

system will be reset (not powered-up), and the system will refer to SWBS to startup from AP

program entrance. For power-up procedure, the HWBS will be referred to decide the program

entrance, but for software reset, SWBS will be referred to.

Switch to the ISP program from AP program

The device also permits the user program switches directly to the ISP program. Just program

an instruction in the AP program as

ISPCR ←

x11xxxxx

b

which sets SWBS 1 to direct the device boot from AP program, and trigger a software reset.

After that, the system will be reset (not powered-up), and the system will refer to SWBS to

startup from ISP program entrance.

MEGAWIN

MPC89x53A Data Sheet

31