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6V7 bảng dữ liệu(PDF) 18 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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6V7 bảng dữ liệu(HTML) 18 Page - Renesas Technology Corp

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Rev.1.00
May 18, 2004
page 18 of 296
M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP
2.3 Reset
There are two kinds of resets; hardware and software. In both cases, operation is the same after the reset.
(See “Software Reset” for details of software resets.) This section explains on hardware resets.
When the supply voltage is in the range where operation is guaranteed, a reset is effected by holding the
reset pin level “L” (0.2VCC max.) for at least 20 cycles. When the reset pin level is then returned to the “H”
level while main clock is stable, the reset status is cancelled and program execution resumes from the
address in the reset vector table.
Figure 2.3.1 shows the example reset circuit. Figure 2.3.2 shows the reset sequence.
Figure 2.3.1 Example reset circuit
RESET
VCCI
0.66V
RESET
VCCI
VCCE
VCCE
0V
0V
3.3V
3.3V
5.0V
2.64V
4.0V
Example when VCCI = 3.3V, VCCE = 5.0V
2.3.1 Software Reset
Writing “1” to bit 3 of the processor mode register 0 (address 000416) applies a (software) reset to the
microcomputer. A software reset has almost the same effect as a hardware reset. The contents of internal
RAM are preserved.



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