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TEA5757HL Scheda tecnica(PDF) 9 Page - NXP Semiconductors |
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TEA5757HL Scheda tecnica(HTML) 9 Page - NXP Semiconductors |
9 / 40 page 2000 Feb 02 9 Philips Semiconductors Product specification Self Tuned Radio (STR) TEA5757HL; TEA5759HL Description of the bus The TEA5757HL; TEA5759HL radio has a bus which consists of three wires, as shown in Table 2. Table 2 Bus signals These three signals, together with the mono/stereo pin (MO/ST; pin 26), communicate with the microcontroller. The mono/stereo indicator has two functions, which are controlled by the BUS-CLOCK, as shown in Table 3. Table 3 Bus-clock functions The TEA5757HL; TEA5759HL has a 25-bit shift register; see Table 4 for an explanation of the shift register bits. If in search mode no transmitter can be found, all frequency bits of the shift register are set to logic 0. The bus protocol is illustrated in Figs 4 and 5. SIGNAL DESCRIPTION PIN BUS-CLOCK software driven clock input 29 DATA data input/output 30 WRITE-ENABLE write/read input 31 BUS-CLOCK MO/ST (PIN 26) RESULT LOW LOW stereo LOW HIGH mono HIGH LOW tuned HIGH HIGH not tuned Table 4 Explanation of the shift register bits Note 1. The output pins 32 and 33 can drive currents up to 5 mA; bits P0.19 and P1.18 control the output voltage of the control pins P0 (pin 32) and P1 (pin 33): a) Bit P0.19 LOW sets P0 (pin 32) to LOW. b) Bit P0.19 HIGH sets P0 (pin 32) to HIGH. c) Bit P1.18 LOW sets P1 (pin 33) to LOW. d) Bit P1.18 HIGH sets P1 (pin 33) to HIGH. BIT DESCRIPTION LOGIC STATE RESULT S.24 (MSB) search start/end 0 after a search when a station is found or after a preset 1 during the search action D.23 search up/down 0 indicates if the radio has to search down 1 indicates if the radio has to search up M.22 mono/stereo 0 stereo is allowed 1 mono is required (radio switched to forced mono) B0.21 band see Table 5 selects FM/MW/LW/SW band B1.20 band see Table 5 selects FM/MW/LW/SW band P0.19 port note 1 user programmable bits which e.g. can be used as band switch driver P1.18 port note 1 user programmable bits which e.g. can be used as band switch driver S0.17 search-level of station see Table 6 determines the locking field strength during an automatic search, automatic store or manual search S1.16 search-level of station see Table 6 determines the locking field strength during an automatic search, automatic store or manual search 15 dummy − buffer F.14 to F.0 (LSB) frequency − determine the tuning frequency of the radio; see Table 7 for the bit values |
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