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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HCS320 датащи(PDF) 13 Page - Microchip Technology |
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HCS320 датащи(HTML) 13 Page - Microchip Technology |
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13 / 38 page  © 2011 Microchip Technology Inc. DS41097D-page 13 HCS320 5.7 SHIFT Key Operation The HCS320 has four switch inputs usually connected to buttons as shown in Figure 2-1: Typical Circuits. Any button connected to input S0, S1 or S2 is called a TRANSMIT button as it causes a transmission when pressed. The SHIFT button is connected to the SHIFT input. Pressing the SHIFT button increments a counter by one count and does not result in a transmission. The counter value is called the shift level. Successive presses of the SHIFT button can increase the shift level up to three before wrapping back to zero. The shift level is available for eight seconds when the SHIFT button is released, after which the shift level is reset to zero. When a TRANSMIT button is pressed, the function code transmitted for that button depends on the shift level. The transmitted function code corresponding to shift level and S0, S1 and S2 switch activation is shown in Table 5-1 for all legal combinations of shift level and button input. Note that a shift level of zero means that the SHIFT button has not been pressed (or it has been pressed four times). The shift level is reset to zero after a transmission. The volatile nature of the shift level register requires the HCS320 to be powered continuously for correct opera- tion and not powered via the buttons. TABLE 5-1: PIN ACTIVATION TABLE SHIFT LEVEL S2 S1 S0 FUNCTION CODE 0 0 0 0 No Transmission 00 0 1 0h 00 1 0 1h 00 1 1 2h 01 0 0 3h 1 0 0 0 No Transmission 10 0 1 4h 10 1 0 5h 10 1 1 6h 11 0 0 7h 2 0 0 0 No Transmission 20 0 1 8h 20 1 0 9h 20 1 1 Ah 21 0 0 Bh 3 0 0 0 No Transmission 30 0 1 Ch 30 1 0 Dh 30 1 1 Eh 31 0 0 Fh |
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