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6. Reset Circuit

Figure 6.1 shows the reset circuit and its waveform. In this product, reset is cleared in about 100 ms

from the instant Vcc passes about 2.1 V after having started from 0 V. When Vcc drops down to about

2.1 V, reset turns effective.

Figure 6.1 Reset circuit and its waveform

By using switch SW4, you can rest the MCU manually.

Table 6.1 Function of switch SW4 (reset switch)

Detected power voltage (V)

About 1.25 x (R1 + R2) / R2

No.

SW4

Name

RESET

Function

This is the reset switch. Press down this switch to reset the MCU.

Input voltage

(IC3-2 pin)

Output state

(IC3-5 pin)

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

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