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VS1103 Datasheet(PDF) 55 Page - VLSI Solution Oy |
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VS1103 Datasheet(HTML) 55 Page - VLSI Solution Oy |
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55 / 61 page  VS1103b Datasheet 8 VS1103B REGISTERS 8.12.4 Timer X Startvalue TIMER_Tx[L/H] The 32-bit start value TIMER_Tx[L/H] sets the initial counter value when the timer is reset. The timer interrupt frequency ft = fi c+1 where fi is the master clock obtained with the clock divider (see Chapter 8.12.2 and c is TIMER_Tx[L/H]. Example: With a 12 MHz master clock and with TIMER_CF_CLKDIV=3, the master clock fi = 3M Hz . If TIMER_TH=0, TIMER_TL=99, then the timer interrupt frequency ft = 3M Hz 99+1 = 30kHz . 8.12.5 Timer X Counter TIMER_TxCNT[L/H] TIMER_TxCNT[L/H] contains the current counter values. By reading this register pair, the user may get knowledge of how long it will take before the next timer interrupt. Also, by writing to this register, a one-shot different length timer interrupt delay may be realized. 8.12.6 Interrupts Each timer has its own interrupt, which is asserted when the timer counter underflows. Version: 1.04, 2018-03-16 55 |
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