Lucent Technologies MN10285K User Manual

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Normally, interrupt servicing starts at address x’0x80008’, but the soft branch 

instruction in the serial writer load program branches to x’0x82018’. This 
address must hold a JMP instruction pointing to the real start address for the 

interrupt service routine.

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This area stores the user program.

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The 3 kilobytes of RAM area starting at address x’0x08000’ are used for the 
serial writer work area. The load program downloads programs to this area that it 

needs to operate the serial writer and program the EEPROM. No other memory 
area can be used for this purpose. You do not need to know about RAM allo-

cation to program the EEPROM.

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Do not write to this area.

For the clock supply to the microcontroller on the target board, use the existing 

target board clock. The OSC oscillator clock for the microcontroller is 4 MHz. 
Using the internal PLL circuit, the microcontroller switches to NORMAL mode 

and operates with a 12-MHz system clock. Table B-6 shows the clock fre-
quencies for the microcontroller during serial programming.

x’0x8000’

|

x’0x8BFF’

3 KB

Serial writer work area

x’0x8C00’

|

x’0x8FFF’

1 KB

Reserved area

4 MHz

12 MHz