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GMS81C5108 Datasheet(PDF) 63 Page - Hynix Semiconductor |
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GMS81C5108 Datasheet(HTML) 63 Page - Hynix Semiconductor |
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63 / 102 page  GMS81C5108 60 JUNE 2001 Ver 1.0 15. Buzzer Output Function The buzzer driver consists of 6-bit binary counter, the buzzer data register BDR and the clock selector. It gener- ates square-wave which is very wide range frequency (500 Hz~125 KHz at fMAIN = 4MHz) by user programmable counter. Pin R04 is assigned for output port of Buzzer driver by set- ting the bit BUZ of Port Mode Register (PMR) to “1”. The 6-bit buzzer counter is cleared and start the counting by writing signal to the register BDR. It is increased from 00H until it matches with BDR[5:0]. Also, it is cleared by counter overflow and count up to out- put the square wave pulse of duty 50%. The bit 0 to 5 of BDR determines output frequency for buzzer driving. BCD is undefined after reset, so it must be initialized to between 0H and 3FH by software. Note that BDR is a write-only register. Frequency calculation is fol- lowing as shown below. The bits BCK1, BCK0 of BDR select the source clock from prescaler output fBUZ: BUZ pin frequency Prescaler ratio: Prescaler divide ratio by BDR[7:6] BCD value: 6-bit compare data, BCD[5:0]. Figure 15-1 Buzzer Driver Example: 2.5kHz output at 4MHz. LDM R0DR,#XXX1_XXXXB LDM BDR,#1001_1000B LDM PMR,#XXX1_XXXXB ;Buzzer ON X means don’t care f BUZ Hz () Oscillator Frequency 2 Prescaler Ratio BCD 1 + () × × ------------------------------------------------------------------------------- = BDR (Buzzer Data Register) ADDRESS : 0FDH RESET VALUE : 00H BCK1 BCK0 BCD5 BCD4 BCD3 BCD2 BCD1 BCD0 ÷ 64 ÷ 16 ÷ 32 MUX COUNTER (6-bit) BCD (6-bit) F/F COMPARATOR BCK[1:0] R04/BUZ PIN ÷ 8 BCK[1:0] (Buzzer Clock Source) BCD[5:0] (Buzzer Control Data) BUZ [PMR.4] Bit manipulation is not available. Buzzer Period Data Bit : 7 6 5 4 3 2 1 0 WW WW WW W W SXIN 0X 1X XIN SCMR[1:0] 2 PMR (Port Mode Register) ADDRESS :0D9H RESET VALUE : -0-00000B - PWMO - BUZ EC0 INT2 INT1 INT0 BUZ (Buzzer Output) 0: R04 Port (turn off buzzer) 1: BUZ port (turn on buzzer) 00: fMAIN ÷23 01: fMAIN ÷24 10: fMAIN ÷25 11: fMAIN ÷26 or fSUB ÷24 or fSUB ÷23 or fSUB ÷26 or fSUB ÷25 |
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Similar Description - GMS81C5108 |
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