M38K09RFS datasheet(103/328 Pages) RENESAS

tên linh kiện	M38K09RFS

Giải thích chi tiết về linh kiện	RENESAS 8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

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FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 05, 2006

page 86 of 112

38K0 Group

REJ09B0337-0200

HARDWARE

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.

M38K09RFS bảng dữ liệu(PDF) 103 Page - Renesas Technology Corp