M38043FFHKP datasheet(102/387 Pages) RENESAS

Teilenummer	M38043FFHKP

Bauteilbeschribung	8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	387 Pages

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Hersteller	RENESAS [Renesas Technology Corp]

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102 / 387 page

1-84

REJ09B0212-0100Z

Rev.1.00

Jan 14, 2005

3804 Group (Spec.H)

HARDWARE

FUNCTIONAL DESCRIPTION

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.

M38043FFHKP Datenblatt(PDF) 102 Page - Renesas Technology Corp