M38K09RFS datasheet(240/328 Pages) RENESAS

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2.13 Flash memory

Rev.2.00

Oct 05, 2006

page 111 of 111

38K0 Group

REJ09B0337-0200

APPLICATION

2.13.8 Notes on CPU rewrite mode

(1)

Operation speed

During CPU rewrite mode, set the internal clock

φ 1.5 MHz or less using the system clock division

ratio selection bits (bits 6 and 7 of address 003B16).

(2)

Instructions inhibited against use

The instructions which refer to the internal data of the flash memory cannot be used during the CPU

rewrite mode .

(3)

Interrupts inhibited against use

The interrupts cannot be used during the CPU rewrite mode because they refer to the internal data

of the flash memory.

(4)

Watchdog timer

In case of the watchdog timer has been running already, the internal 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 released, boot mode is active. So the

program starts from the address contained in address FFFC16 and FFFD16 in boot ROM area.

M38K09RFS bảng dữ liệu(PDF) 240 Page - Renesas Technology Corp