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HCS320 数据表(PDF) 13 Page - Microchip Technology

部件名 HCS320
功能描述  KEELOQ Code Hopping Encoder
PDF  32 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

HCS320 数据表(HTML) 13 Page - Microchip Technology

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© 2001 Microchip Technology Inc.
DS41097C-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
000
No Transmission
0
001
0h
0
010
1h
0
011
2h
0
100
3h
1
000
No Transmission
1
001
4h
1
010
5h
1
011
6h
1
100
7h
2
000
No Transmission
20
0
1
8h
2
010
9h
2
011
Ah
2
100
Bh
3
000
No Transmission
3
001
Ch
3
010
Dh
3
011
Eh
3
100
Fh



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