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MCS3122-I/ST датащи(PDF) 9 Page - Microchip Technology |
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MCS3122-I/ST датащи(HTML) 9 Page - Microchip Technology |
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9 / 26 page ![]() 2014 Microchip Technology Inc. DS40001762A-page 9 MCS3122 4.0 ADVANCED KEELOQ® TECHNOLOGY OPERATION 4.1 Synchronization Counter This is the 24-bit synchronization value that is used to create the hopping code for transmission. This value will be incremented after every transmission. The initial value of the synchronization counter may be set via the Synchronization Counter Initial Value registers (see Table 3-2 and Table 3-3). 4.2 Function Code (Button Status Code) The function code is a bitmapped representation of the state of each button on the transmitter. States are active-high. 4.3 Serial Number Each Advanced KEELOQ encoder transmits its 32-bit serial number with each transmission. It is intended that this serial number be unique to a system. It is set in the Serial Number Configuration registers, listed in Table 3-7. 4.4 Seed Code Serial Number The transmitter has the possibility to set the serial number which will be transmitted with a seed transmission. In a typical system, this serial number is transmitted as 0xFFFFFFFF; however, the user can configure this according to the actual application. The seed code serial number is set in the Seed Code Configuration registers, listed in Table 3-4. TABLE 4-1: ADVANCED KEELOQ® BUTTON CODE TRANSLATION Button Function Code SW0 xx1 SW1 x1x SW2 1xx |
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