7641 datasheet(322/385 Pages) RENESAS

Part #	7641

Description	8-BIT SINGLE-CHIP MICROCOMPUTER

PDF	385 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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322 / 385 page

Rev.2.00

Aug 28, 2006

page 43 of 108

7641 Group

REJ09B0336-0200

APPENDIX

3.3 Notes on use

3.3.15 Notes on CPU rewrite mode for flash memory version

The below notes applies when rewriting the flash memory in CPU rewrite mode.

(1) Operation speed

During CPU rewrite mode, set the internal clock

φ to 6 MHz or less using the XIN divider select bit

(bit 7 of address 001F16).

(2) Instructions inhibited against use

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

rewrite mode .

(3) Interrupts inhibited against use

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

the flash memory.

(4) Reset

Reset is always valid. When CNVSS is “H” at reset release, the program starts from the address

stored in addresses FFFA16 and FFFB16 of the boot ROM area in order that CPU may start in boot

mode.

7641 Datasheet(PDF) 322 Page - Renesas Technology Corp