M38041F8HKP datasheet(83/116 Pages) RENESAS

No. de pieza	M38041F8HKP

Descripción Electrónicos	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PDF	116 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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83 / 116 page

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.

M38041F8HKP Datasheet(PDF) 83 Page - Renesas Technology Corp