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7721 датащи(PDF) 75 Page - Renesas Technology Corp

номер детали 7721
подробное описание детали  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 датащи(HTML) 75 Page - Renesas Technology Corp

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RESET
7721 Group User’s Manual
4–12
______
4.1.4 Time supplying “L” level to RESET pin
______
Time supplying “L” level to the RESET pin varies according to the state of the clock oscillation circuit.
qWhen the oscillator is stably oscillating or a stable clock is input from the XIN pin, supply “L” level for
2
µs or more.
qWhen the oscillator is not stably oscillating (including the case at power-on reset or in Stop mode), supply
“L” level until the oscillation is stabilized.
The time required for stabilizing oscillation varies according to the oscillator. For details, contact the
oscillator manufacturer.
Figure 4.1.11 shows the power-on reset conditions. Figure 4.1.12 shows an example of a power-on reset
circuit.
V For details about Stop mode, refer to section “5.3 Stop mode.” For details about clocks, refer to
“CHAPTER 5. CLOCK GENERATING CIRCUIT.”
4.1 Hardware reset
Fig. 4.1.11 Power-on reset conditions
Fig. 4.1.12 Example of power-on reset circuit
0V
0V
Vcc
RESET
Powered on here
4.5V
0.9V
1
IN
OUT
GND
Delay
capacity
RESET
Vcc
Vss
47
SW
Cd
GND
3
25
5 V
M51957AL
M37721
27 k
10 k
4
V The delay time is about 11 ms when Cd = 0.033
µF.
td
≈ 0.34 ! Cd [ µs], Cd: [ pF ]
Vcc



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