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HCS360-SN Datasheet(PDF) 9 Page - Microchip Technology |
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HCS360-SN Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 24 page  HCS360 © 1996 Microchip Technology Inc. Preliminary DS40152C-page 9 3.5.6 IND: INDEPENDENT MODE The independent mode can be used where one encoder is used to control two receivers. Two counters (SYNC_A and SYNC_B) are used in independent mode. As indicated in Table 3-7, function codes 1 to 7 use SYNC_A and 8 to 15 SYNC_B. The independent mode also selects IR mode. In IR mode function codes 12 to 15 will use SYNC_B. The PWM output signal is modulated with a 40 kHz carrier. It must be pointed out the 40 kHz is derived from the internal clock and will therefore vary with the same percentage as the baud rate. If IND = 0, SYNC_A is used for all function codes. If IND = 1, independent mode is enabled and counters for functions are used according to Table 3-7. For IND = 1 and S[3:0] ≡ 0xC, 0xD, 0xE, 0xF, Basic Pulse Width modulation becomes: 3.5.7 USRA,B: USER BITS User bits form part of the discrimination value. The user bits together with the IND bit can be used to identify the counter that is used in independent mode. 3.5.8 XSER: EXTENDED SERIAL NUMBER If XSER = 1, the full 32-bit serial number [SER_1, SER_0] is transmitted. If XSER = 0, the four most sig- nificant bits of the serial number are substituted by S[3:0] and is compatible with the HCS200/300/301. 3.5.9 TMPSD: TEMPORARY SEED TRANSMISSION The temporary seed transmission can be used to dis- able learning after the transmitter has been used for a programmable number of operations. This feature can be used to implement very secure systems. After learn- ing is disabled, the seed information cannot be accessed even if physical access to the transmitter is possible. If TMPSD = 1 the seed transmission will be disabled after a number of code hopping transmissions. The number of transmissions before seed transmission is disabled, can be programmed by setting the synchro- nization counter (SYNC_A, SYNC_B) to a value as shown in Table . TABLE 3-6 SYNCHRONOUS COUNTER INITIALIZATION VALUES Synchronous Counter Values Number of Transmissions 0000H 128 0060H 64 0050H 32 0048H 16 TABLE 3-7 FUNCTION CODES S3 S2 S1 S0 IND = 0 IND = 1 Comments Counter 1 0 0 0 1 A A 2 0 0 1 0 A A 3 0 0 1 1 A A If SEED = 1, transmit seed after delay. 4 0 1 0 0 A A 5 0 1 0 1 A A 6 0 1 1 0 A A 7 0 1 1 1 A A 8 1 0 0 0 A B 9 1 0 0 1 A B If SEED = 1, transmit seed immediately. 10 1 0 1 0 A B 11 1 0 1 1 A B 12 1 1 0 0 A B IR mode 13 1 1 0 1 A B IR mode 14 1 1 1 0 A B IR mode 15 1 1 1 1 A B IR mode |
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