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R29 bảng dữ liệu(PDF) 48 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES
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R8C/28 Group, R8C/29 Group
5. Resets
Rev.2.10
Sep 26, 2008
Page 29 of 441
REJ09B0279-0210
Figure 5.9
Example of Power-On Reset Circuit and Operation (J, K version)
RESET
VCC
4.7 k
Ω
(reference)
NOTES:
1. When using the voltage monitor 1 digital filter, ensure VCC is 2.0 V or higher during the sampling time.
2. The sampling clock can be selected. Refer to 6. Voltage Detection Circuit for details.
3. Vdet1 indicates the voltage detection level of the voltage detection 1 circuit. Refer to 6. Voltage Detection
Circuit for details.
4. Refer to 20. Electrical Characteristics.
5. To use the power-on reset function, enable voltage monitor 1 reset by setting the LVD1ON bit in the OFS
register to 0, the VW1C0 and VW1C6 bits in the VW1C register to 1 respectively, and the VCA26 bit in the
VCA2 register to 1.
Vdet1(3)
Vpor1
Internal reset
signal
(“L” valid)
tw(por1)
Sampling time(1, 2)
Vdet1(3)
Vpor2
× 32
1
fOCO-S
× 32
1
fOCO-S
2.0 V
trth
trth
External
power VCC
td(Vdet1-A)



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