Four, the micro-controller circuit analysis
Micro-controller circuit to the main microcontroller (MCU) IC403 (M30840SGP) micro-controller and Deputy (Vice-MCU) IC407 (S3F866) as the core component, as shown in figures 11-12, 11-13.

1. main main microcontroller microcontroller working conditions IC403 to work correctly, you must have the following 3 working conditions:

Is the power supply properly. In other words, IC403 14, 60, 97 feet have normal 3.3V power supply.

Second, clock oscillator signal is normal. IC403 11, 13 foot external clock crystal X400 (10MHz) and capacitor C413, C414, composed together with the internal circuits oscillator circuits, after frequency clock signal generated by IC403, clock signal needed to provide work for IC403, IC403 synchronization coordination.

Third, reset signal is normal. IC403 ⑩ feet to reset client receives signals from the Deputy microcontroller IC407 29 foot, when powered on, the IC407 output a reset signal, complete reduction of the main microcontroller IC403.

2. micro-controller working conditions
As with the main microcontroller, Vice-IC407 micro-controller to work properly, you must have the following 3 working conditions:

Is the power supply properly, IC407 f, 21 feet to have normal 3.3V the power supply.

Second, clock oscillator signal is normal. IC407 h, Krispy Kreme is feet add-ins clock crystal X401 (24MHz) and capacitor C431, C432, together with IC407 internal circuit composed of oscillating circuit, after frequency clock signal generated by IC407, clock signal needed to provide work for IC407.

Third, reset signal is normal. IC407 13 PIN to reset client an external reset circuit for IC409 (DS1834AS), IC409 internal circuit diagram is shown in Figure 11-14, pin functions as shown in table 11-1.




When the power output a reset signal by IC409 II foot, added to the 13 foot IC407, complete the Vice-IC407 of micro-controller reset.

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