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IZ7008 Folha de dados(PDF) 10 Page - Integral Corp. |
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IZ7008 Folha de dados(HTML) 10 Page - Integral Corp. |
10 / 16 page IZ7008 Korzhenevskogo 12, Minsk, 220064, Republic of Bel- arus Fax: +375 (17) 278 28 22, Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61, 277 69 16 E-mail: belms@belms.belpak.minsk.by URL: www.bms.by 10 quency forming in timer 2) and "short" pulses FrT2, FrT3 setting respectively interrupt request flag FR2 into 1 (bit 5 of the state register R7) and Interrupt request flag FR3 in the states register R7 (bit 6 of the state register R7) are formed. Flag FR2 is not set into mode of notes frequency forming in timer T2 and in mode when "short" pulse FrT2 of timer T2 clearing is input signal of timer T3. The timers are controlled by timers control register RFBO (address 0x7D8) Description of RFBO control register bits: Bit Symbol Description After reset RFBO_7 IN1-T3 0 RFBO_6 IN0-T3 7,6 bits choose source of timer T3 input signal 00 – signal of ripple-through carry of timer T1 («short» pulse FrT1) 01 – output Т1_3 of timer Т1 (2048Hz) 10 – signal of clearing timer Т2 («short» pulse FrT2), in this mode setting of flag FR2 is inhibited 11 – external signal IN6 (output 06 when disconnecting SEG 01 by mask) 0 RFBO_5 IN1-T2 0 RFBO_4 IN0-T2 5,4 bits choose source of timer T2 input signal 00 – signal of ripple-through carry of timer Т1 («short» pulse FrT1) 01 – output Т1_3 of timer Т1 (2048Hz) 10 – signal 65565 Hz (notes frequency forming mode), in this mode setting of FR2 flag is inhibited 11 –external signal IN6, IN7, IN8 (from outputs 06, 07 or 08 when disconnecting corre- sponding SEG 01, SEG 02, SEG 03 by mask) 0 RFBO_3 CLR-T3 1-clearing (reset and zero code fixation) of T3 timer counter, reset of FR3 flag (except mode, when T3 is clocked by FrТ2 signal; in this mode RFBO_3 and RFBO_1 shoose source of input signal Т2: 00-IN7, 01-IN6 ,1X –IN8) 0 RFBO_2 CLR-T2 1-clearing (reset and zero code fixation) of T2 timer counter, reset of FR2 flag and T3 timer with reset of FR3 flag (when T3 is clocked by FrТ2 signal) 0 RFBO_1 EN-T3 1/0- (count enable) /(count inhibit) Т3 (except mode when Т3 is clocked by FrТ2 signal; in this mode RFBO_3 and RFBO_1 shoose source of input signal Т2: 00-IN7, 01-IN6 ,1X –IN8)) 0 RFBO_0 EN-T2 1/0- (count enable) / (count inhibit) Т2 (always) and (count enable) / (count inhibit) Т3 (when T3 is clocked by FrТ2 signal ) 0 Timer Т2 can be used in the mode of notes frequency forming for tunes synthesis. The mode is selected when recording code «10» into 5,4 bits of RFBO control register (IN1-T2=1, IN0- T2 = 0 ) and timer count enabling. RFBO_7 RFBO_6 RFBO_5 RFBO_4 RFBO_3 RFBO_2 RFBO_1 RFBO_0 IN1-T3 IN0-T3 IN1-T2 IN0-T2 CLR-T3 CLR-T2 EN-T3 EN-T2 X X 1 0 X 0 X 1 In this mode setting of interrupt request flag FR2 in the state register R7 is inhibited. Signal of 65565 Hz is applied on counter input.. Notes frequency is formed on counter output (output T2_7) and can be applied on external output "AL" at the set into 1 flag AL_EN in the state register R7. Seven lower counter bits count in the beginning of zero semi-period of note. After reaching the code equal to the contents of 7 lower bits of KT2 register, 7 lower bits of the counter are cleared but the highest bit is switched into logic 1 and then the note second (unit) semi- period is counted in the same way. As a result on output the frequency of 65565Hz/2N is formed, where N is number from 2 to 127, set in 7 lower bits of register KT2. To form notes period with accuracy to one period of input frequency 65565 Hz the following possibility is forseen. When setting in register KT2 the higher bit of KT register in logic 1 when counting the second (unit) semi-period at code |
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