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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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7516 Scheda tecnica(PDF) 53 Page - Renesas Technology Corp |
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7516 Scheda tecnica(HTML) 53 Page - Renesas Technology Corp |
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53 / 90 page  Rev.1.01 Jul 01, 2003 page 53 of 89 7516 Group Precautions on CPU Rewrite Mode Described below are the precautions to be observed when rewriting the flash memory in CPU rewrite mode. (1) Operation speed During CPU rewrite mode, set the internal clock frequency 4.0 MHz or less using the main clock division ratio selection bits (bit 6, 7 at 003B16). (2) Instructions inhibited against use The instructions which refer to the internal data of the flash memory cannot be used during CPU rewrite mode . (3) Interrupts inhibited against use The interrupts cannot be used during CPU rewrite mode be- cause they refer to the internal data of the flash memory. (4) Watchdog timer In case of the watchdog timer has been running already, the in- ternal reset generated by watchdog timer underflow does not happen, because of watchdog timer is always clearing during program or erase operation. (5) Reset Reset is always valid. In case of CNVSS = H when reset is re- leased, boot mode is active. So the program starts from the ad- dress contained in address FFFC16 and FFFD16 in boot ROM area. |
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