7516 datasheet(53/90 Pages) RENESAS

tên linh kiện	7516

Giải thích chi tiết về linh kiện	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PDF	90 Pages

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53 / 90 page

Rev.1.01

Jul 01, 2003

page 53 of 89

7516 Group

Precautions on CPU Rewrite Mode

Described below are the precautions to be observed when rewriting

the flash memory in CPU rewrite mode.

(1) Operation speed

During CPU rewrite mode, set the internal clock frequency 4.0

MHz or less using the main clock division ratio selection bits (bit

6, 7 at 003B16).

(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 be-

cause they refer to the internal data of the flash memory.

(4) Watchdog timer

In case of the watchdog timer has been running already, the in-

ternal 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 re-

leased, boot mode is active. So the program starts from the ad-

dress contained in address FFFC16 and FFFD16 in boot ROM

area.

7516 bảng dữ liệu(PDF) 53 Page - Renesas Technology Corp