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M306V2EEFS Datasheet(PDF) 18 Page - Renesas Technology Corp

No. de pieza M306V2EEFS
Descripción Electrónicos  SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
PDF  271 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
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M306V2EEFS Datasheet(HTML) 18 Page - Renesas Technology Corp

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Rev.1.40
Oct 06, 2004 page 18 of 269
M306V2ME-XXXFP, M306V2EEFP
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
VCC
0.9V
RESET
VCC
0V
0V
5V
5V
4.5V
Example when f(XIN) = 10 MHz and VCC = 5V.
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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