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38K2 Datasheet(PDF) 103 Page - Renesas Technology Corp |
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38K2 Datasheet(HTML) 103 Page - Renesas Technology Corp |
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103 / 151 page  38K2 Group Rev.3.00 Oct 15, 2006 page 103 of 147 REJ03B0193-0300 Notes on CPU Rewrite Mode Take the notes described below when rewriting the flash memory in CPU rewrite mode. qOperation speed During CPU rewrite mode, set the internal clock φ to 1.5 MHz or less using the system clock division ratio selection bits (bits 6 and 7 of address 003B16). qInstructions inhibited against use The instructions which refer to the internal data of the flash memory cannot be used during CPU rewrite mode . qInterrupts inhibited against use The interrupts cannot be used during CPU rewrite mode because they refer to the internal data of the flash memory. qWatchdog timer If the watchdog timer has been already activated, internal reset due to an underflow will not occur because the watchdog timer is surely cleared during program or erase. qReset Reset is always valid. The MCU is activated using the boot mode at release of reset in the condition of CNVss = “H”, so that the pro- gram will begin at the address which is stored in addresses FFFC16 and FFFD16 of the boot ROM area. |
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