MN102HF75K Flash EEPROM VersionUsing the Onboard Serial Programming ModePanasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual324Panasonicn Branch instruction to interrupt service routineNormally, interrupt servicing starts at address x’0x80008’, but the soft branchinstruction in the serial writer load program branches to x’0x82018’. Thisaddress must hold a JMP instruction pointing to the real start address for theinterrupt service routine.n User program areaThis area stores the user program.B.4.4.2 RAM Address Spacen Serial writer work areaThe 3 kilobytes of RAM area starting at address x’0x08000’ are used for theserial writer work area. The load program downloads programs to this area that itneeds to operate the serial writer and program the EEPROM. No other memoryarea can be used for this purpose. You do not need to know about RAM allo-cation to program the EEPROM.n Reserved areaDo not write to this area.B.4.5 Microcontroller Clock on the Target BoardFor the clock supply to the microcontroller on the target board, use the existingtarget board clock. The OSC oscillator clock for the microcontroller is 4 MHz.Using the internal PLL circuit, the microcontroller switches to NORMAL modeand operates with a 12-MHz system clock. Table B-6 shows the clock fre-quencies for the microcontroller during serial programming.Table B-5 RAM Address Space in Serial Programming ModeAddress Size Descriptionx’0x8000’|x’0x8BFF’3 KB Serial writer work areax’0x8C00’|x’0x8FFF’1 KB Reserved areaTable B-6 Microcontroller Clock Frequencies during Serial ProgrammingOscillator Clock Frequency Internal System Clock Frequency4 MHz 12 MHz
