38K2 datasheet(261/358 Pages) RENESAS

Part #	38K2

Description	RENESAS 8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	358 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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261 / 358 page

2.14 Flash memory

Rev.2.00

Oct 15, 2006

page 112 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

2.14.8 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.

38K2 Datasheet(PDF) 261 Page - Renesas Technology Corp