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7643 bảng dữ liệu(PDF) 361 Page - Renesas Technology Corp

tên linh kiện 7643
Giải thích chi tiết về linh kiện  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  424 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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7643 bảng dữ liệu(HTML) 361 Page - Renesas Technology Corp

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7643 Group
REJ09B0133-0200
APPENDIX
3.3 Notes on use
Rev.2.00
Aug 28, 2006
page 38 of 98
3.3.14 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.



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