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M38046FFHKP датащи(PDF) 83 Page - Renesas Technology Corp

номер детали M38046FFHKP
подробное описание детали  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  116 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M38046FFHKP датащи(HTML) 83 Page - Renesas Technology Corp

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Rev.1.01
Jan 25, 2005
page 83 of 114
REJ03B0131-0101Z
3804 Group (Spec. H)
s 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 system clock
φ to 4.0 MHz or
less using the clock division ratio selection bits (bits 6 and 7 of ad-
dress 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
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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